Answer:
There are approximately 5 × 10¹⁰ capillaries in the human body
Explanation:
The motion of a fluid is such that the mass of the fluid flowing remains constant. This is known as the principle of conservation of mass in liquid flow.
The mass flow rate is the mass that passes a given point per unit time. According to the principle of conservation of mass, the flow rates at any two points must be equal, as long as no fluid is being added or taken away.
The principle gives rise tonthe continuity equation which is given below:
ρ₁A₁v₁ = ρ₂A₂v₂
Where ρ is density of fluid, A is internal area of the vessel or pipe the fluid is flowing through, v is velocity of the fluid
Since the density of blood is constant, the continuity equation above reduces to:
A₁v₁ = nA₂v₂
where A₁ is the area of the aorta, v₁ is velocity of bloodmin the aorta, n is number of capillaries, A₂ area of capillary, v₂ is velocity of blood in the capillary.
n = A₁v₁/A₂v₂
n = πr₁² × v₁ / πr₂² × v₂ where r₁ is radius of aorta and r₂ is radius of capillaries
n = (22/7 × 1.2² × 42) / (22/7 × 0.0005² × 0.005)
n = 4.8384 × 10¹⁰capillaries
Therefore, there are approximately 5 × 10¹⁰ capillaries in the human body
the blood speed in a normal segment of a horizontal artery is 0.15 m/s. An abnormal segment of the artery is narrowed by an arteriosclerotic plaque down to one fifth its normal cross sectional area. What is the difference in blood preassures between the normal and constricted segments of the artery. The density of the blood is 1060
Answer:
286.2 pa
Explanation:
Blood speed in a normal segment of a horizontal artery ( v2 ) = 0.15 m/s
Density of blood = 1060 kg/m^3
Normal sectional area = A2
constricted sectional area ( A1 )= 1/5 A2
Determine the difference in blood pressures between the normal and constricted segments
we will apply Equation of continuity Av = constant
Δ p = 12 PV^2
= 12 * 1060 * ( 0.15 )^2
= 12720 * 0.0225 = 286.2 pa
attached below is a detailed solution of the Given problem
help pliz :3 I need your help and thank you <3
Answer:
need to answer all??tell
FAKE ANSWERS WILL GET REPORTED.
PLEASE HELP !!!! ILL GIVE BRAINLIEST !!!
PLEASE HELP !!!! ILL GIVE BRAINLIEST !!!
PLEASE HELP !!!! ILL GIVE BRAINLIEST !!!
PLEASE HELP !!!! ILL GIVE BRAINLIEST !!!
Answer:
a.
Explanation: i had this in a social studies test before its a
Answer:
IN my opinion, it should be B
Explanation:
how do you feel nonrenewable energy impacts the environment?
Answer:
Explanation:
Non renewable energy typically releases carbon dioxide, methane, and other gasses into the atmosphere.
PLEASE HELP ME OUT KINDA URGENT
Answer:
the first one
Transcribe the following DNA strand: ATGCATTGCGAT
Which trophic level do anacondas and jaguars fill in the Amazon rainforest?
Answer:
tertiary consumer
Explanation:
Someone help thank you
Answer:
because its faster
Explanation:
Infer how the structure of the root would be impacted in the absence of each of these
structures.
Answer:
I cant see them
Explanation:
Please Provide a picture.
1. Define physical change.
2. What are some examples of physical change?
3. The wood in the Figure below is being cut with a chainsaw. Is this a physical change?
Why or why not?
Select all the true statements about how plants use and change energy.
Answer:
where are the questions?
Ashton is a crime scene investigator. He ensures that all the evidence gathered at the scene is properly handled and labeled. What is Ashton protecting?
Ashton ensures that the (blank) the documentation of who possesses evidence at all times, is protected by properly handling and labeling evidence.
when it says (blank) it means evidence evidence.
34:58
What is the source of energy that drives photosynthesis?
O sunlight
hydrogen ions
o electrons
O oxygen
"pe here to search
O
Desktop
Answer:
Sunlight
Explanation:
Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct. Therefore, it is sunlight.
What three processes or forces
combine to set convection
currents in motion?
Answer:
There are three types of heat transfer: radiation, conduction, and convection. Heating and cooling of the fluid, changes in the fluid's density, and the force of gravity combine to set convection currents in motion.
Explanation:
How many genes do u have for each trait?
Answer:
please give me brainlist and follow
Explanation:
An international research effort called the Human Genome Project, which worked to determine the sequence of the human genome and identify the genes that it contains, estimated that humans have between 20,000 and 25,000 genes. Every person has two copies of each gene, one inherited from each parent.
where is the best place to find information about the hazards that area associated with a compound
Answer:
Read a Material Safety Data Sheet (MSDS).
Explanation:
Which describes a similarity between abiotic and biotic factors?
Answer: They are both necessary for organisms to survive.
Explanation:
Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, and minerals. Biotic factors are living or once-living organisms in the ecosystem.
PLEASE HELP WITH THIS!!!
Answer:
my mama is my mom
Explanation:
mum gae
What enzyme deficiency in RBC leads to hemolytic anemia due to oxidative stress?
In some cases, massive destruction of red blood cells caused death. This drug-induced hemolytic anemia was shown 30 years later to be caused by a deficiency of glucose 6-phosphate dehydrogenase, the enzyme catalyzing the first step in the oxidative branch of the pentose phosphate pathway.
in short terms, glucose 6-phosphate dehydrogenase
Which of the following is not correct about diffraction?
Answer:
Diffraction occurs just with electromagnetic waves.
Explanation:
The information that should not be true about diffraction is that it arise with the electromagnetic waves only.
What is diffraction?It is considered as the process where the beam of light or the other system waves should be spread out that leads of passing via the narrow aperture or it should be an across of an edge that should be accompanied by interfering between the formation of the waves that should be generated.
So the above information should be considered.
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Match the bacterial type with its proper definition. An answer choice can only be used once. A. Requires oxygen, but is toxic at atmospheric concentrations B. Can use oxygen for growth or can grow without it C. In fluid thitoglycollate medium, shows growth only at the top area of the medium D. Oxygen is completely toxic to it A. microaerophile B. facultative anaerobe C. obligate aerobe D. obligate anaerobe E. aerotolerant anaerobe
Answer:
ABCDExplanation:
Bacteria is classified into 5 different groups basically on their shapes which are spherical, rod, spiral, vibrios and corkscrew
A) Requires oxygen, but is toxic at atmospheric concentrations
Microaerophile
B) Can use oxygen for growth or can grow without it
Facultative anaerobe
C) In fluid thitoglycollate medium, shows growth only at the top area of the medium
Obligate aerobe
D) Oxygen is completely toxic to it
Obligate anaerobe
In plant and animal adaptations, form follows function. True or false?
Answer:
FALSE
Explanation:
In plant and animal adaptations, form follows function. it is true because all forms of organisms give adaptive advantages.
AdaptationLiving beings tend to have adaptations according to the environment in which they live. Plants in hot and dry climates generally have their leaves reduced, or even modified into thorns, as a way of reducing the contact surface and thus avoiding transpiration.
Whit this information, we can conclude that in plant and animal adaptations, form follows function. it is true because all forms of organisms give adaptive advantages.
Learn more about adaptive advantages in brainly.com/question/22557205
2. Define the structure of DNA by filling in the
descriptions below
Answer:
Please refer to the explanation below.
Explanation:
The sugar and phosphates molecules form the sides of the helix.
The nitrogen bases form the teeth of the helix.
Each nucleotide is made of a nitrogen base, a sugar, and a phosphate group.
Briefly explain the nature of scientific inquiry. Include discussion of the role that evidence and falsifiability play in the process. Is this a strength or a weakness of the scientific mode of
thinking?
Answer:
Science is a process that involves proof and error. Scientific hypotheses are used to find evidence supporting scientific statements, but new evidence can be used to reject previously accepted ones in order to get closer to the truth.
Explanation:
Scientific inquiries refer to the processes by which scientists study phenomena of the natural world and propose alternative explanations (hypotheses) useful for understanding such mechanisms. When hypotheses are supported by many evidence and studies from different sources, scientific theories associated with these hypotheses become accepted by the scientific community. In science, a scientific statement may become falsifiable when it is contradicted by new lines of evidence and/or new observations.
In the late 1980s and early 1990s, the percentage of Icelandic children whose bacterial infections were caused by bacteria resistant to penicillin rose at an alarming rate. After public health officials initiated a campaign to reduce the use of penicillin, resistance dropped off. This observation is consistent with the hypothesis that ________.
Answer:
The correct answer would be - "bacterial populations evolve in response to the selection pressure imposed by antibiotics".
Explanation:
The given information provided in the question about the bacterial infection supports the hypothesis that the bacterial population shows the evolution in response to the selection pressure caused by the antibiotics due to the fact that bacteria increased resistance gradually with time. This resistance towards antibiotics increased the percentage of bacterially infected children in the late 1980s and early 1990s.
In this case, the population of bacteria having resistance genes is selected to evolved selected to increase their offsprings.
I NEED HELP WITH SCIENCE!!!
1. Which term names the action that is happening when an acid eats away part of a metal bar?
weathering
corrosion
alkalizing
neutralizing
2. Which group of compounds tastes bitter and are usually slippery when placed in water?
metalloids
bases
corrosives
acids
3.Which number represents the pH of pure water?
1
7
11
14
4.What is the pH of sulfuric acid?
under 7
7
over 7
exactly 14
5.What is the pH of the lye in soap?
exactly 3
under 7
over 7
8
Answer:
corrosionbases7It warys of how much concentration there is over 7EXPLANATION:
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Alkali substances has a pH greater than 7 hence it follows that the lye in soap has a pH over 7.
What is corrosion?
The term corrosion has to do with the waering away of a metal surface due to the action of oxidation. Hence the term applicable is corrosion.
The bases are know to be have a bitter taste and are slippery to touch hence the correct response is bases.
Water is a neutral substance, in the pH scale, a neutral substance has a pH of 7 hence the pH of water is 7.
Sulfuric acid is an acid and acids have a pH that is below 7 hence the pH of sulfuric acid is under 7.
Given the fact that alkali substances has a pH greater than 7, it follows that the lye in soap has a pH over 7.
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Given that cellular respiration uses oxygen and produces carbon dioxide, which of the following statements can be inferred from the diagram shown above?
A. Animals participate in cellular respiration, while plants participate in both cellular respiration and photosynthesis.
B. Animals do not rely on plants for survival.
C. Animals participate in cellular respiration because it results in the same products as photosynthesis.
D. Animals participate in cellular respiration, while plants do not.
Answer:
A. Animals participate in cellular respiration, while plants participate in both cellular respiration and photosynthesis.
Explanation:
The option (A) is correct. Animals participate in cellular respiration, while plants participate in both cellular respiration and photosynthesis.
What do you mean by cellular respiration?Cellular respiration is the process by which biological fuels are oxidized in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, to drive the bulk production of ATP.
Cellular respiration is a series of chemical reactions that break down glucose to produce ATP, which may be used as energy to power many reactions throughout the body. There are three main steps of cellular respiration: glycolysis, the citric acid cycle, and oxidative phosphorylation.
During cellular respiration, a glucose molecule is gradually broken down into carbon dioxide and water. Along the way, some ATP is produced directly in the reactions that transform glucose. Much more ATP, however, is produced later in a process called oxidative phosphorylation.
Learn more about cellular respiration:
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List 3 inputs (things entering) for the leaf in Model 1.
Answer:
light energy,carbon dioxide, and water
Explanation:
Answer:
light energy,carbon dioxide , water
In the beginning of "A Growing Problem," how does the author
introduce his argument that nonnative species should not live in
Florida?
O A. by comparing Florida to Southeast Asia
O
B. by comparing pythons to alligators
O
C. by referencing facts about the dangers of pythons
O
D. by referencing people's expectations of the Everglades
Answer: D
Explanation:
i took the quiz
Answer:
D.
Explanation:
I JUST submitted the test
Why does warm air always rise at a front?