Biology, 23.07.2019 22:20 micahsocool23

The human circulation system has approximately 1×109 capillary vessels. each vessel has a diameter of about 8 µm . assuming cardiac output is 5 l/min, determine the average velocity of blood flow through each capillary vessel.

Answers: 1

Show answers

Answers

It seems you mean 1x10^9 because there are a lot of capillaries indeed. The answer I got is v = 1.65788 * 10^9 meters / second

Given:
vessel diameter = D = 8um
r = D/2 = 4um
v = velocity of blood flow is equal to cardiac output / total capillary area

So, v = Q/A

Where:
Q = cardiac output = 5 liters / minute
A = total capillary area = pi(r^2) multiplied by the number of capillaries

Solve A = pi(r^2) x 10^9
A = pi(4um^2) x 10^9
= pi(16um^2) x 10^9 = 50265000000 um^2

Convert to meters. You will get 50265 m^2

Since velocity uses a meters/second unit format, you should convert Q to something more applicable.

Q = 5 Liters / minute
= 5 L/minute x 0.001 cubic meter/ 1L
= 0.005 m^3/minute

Combine them all and you will get:

v = Q/A = (0.005m^3 / min) / 50265 m^2 = 0.005 m^3 / (min)(50265 m^2)

Then convert minute to seconds, and cancel out m^2 with m^3.

v = 0.005m / 50265 minutes (1minute / 60 seconds) = 0.005m / [60(50265)] seconds

v = 0.00000000165788 meters / second
= 1.65788 * 10^9 meters / second

Answer from: Quest

Mg is used to measure mass

Answer from: Quest

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.

for example:

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer. you start to feel bad.

Other questions on the subject: Biology

Biology, 22.06.2019 01:00, stodd9503

If water were a non polar molecule, how would its properties be different ? a.) water would be a much lighter molecule b.) water would be able to climb up inside plants c.)water would not be able to form hydrogen bonds d.) water would stick together much more strongly

Answers: 2

continue

Biology, 22.06.2019 04:30, electrofy456

Asap i will reward you brainliest for best which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

Answers: 1

continue

Biology, 22.06.2019 04:30, mimas76

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

Answers: 2

continue

Biology, 22.06.2019 10:30, Xavitheking2542

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna. b) they study alleles that contain genes, which are chromosomes. c) they study chromosomes that contain genes, which are dna segments.

Answers: 1

continue

You know the right answer?

The human circulation system has approximately 1×109 capillary vessels. each vessel has a diameter o...