Sydney Medical School: Cardiovascular System Lecture 7 Quiz

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What is the primary role of capillaries in the microcirculation?

Generating blood flow velocity

Producing white blood cells

Transporting nutrients and oxygen to tissues (correct)

Regulating blood pressure

How does blood flow velocity differ from blood flow in the context of microcirculation?

Blood flow velocity is the same as blood pressure, while blood flow refers to heart rate.

Blood flow velocity represents the volume of blood moved per unit time, while blood flow is the pressure exerted by the blood on vessel walls.

Blood flow velocity depends on vessel size, while blood flow does not.

Blood flow velocity refers to the speed of blood in a specific vessel, while blood flow is the overall movement of blood in the circulatory system. (correct)

Why does an increase in total surface area positively impact blood flow velocity?

It decreases the demand for oxygen in tissues.

It increases the pressure inside the vessels.

It reduces friction between blood and vessel walls.

It allows for more efficient exchange of substances at the capillary level. (correct)

What are the 3 ways substances are typically moved out of or into a capillary?

Diffusion, osmosis, active transport Signup and view all the answers

Which of the following roles does the lymphatic system play in regulating extracellular fluid volume?

Transporting excess fluid back to the bloodstream Signup and view all the answers

What is the main function of capillaries in the human body?

To facilitate gas exchange Signup and view all the answers

Which vessel type is characterized by the presence of a high proportion of smooth muscle and is densely innervated by sympathetic nerves?

Arterioles Signup and view all the answers

Why do capillaries have a slow flow rate?

To maintain low capillary pressure Signup and view all the answers

What is the primary function of metarterioles in the microcirculation system?

To act as arterio-venous shunts Signup and view all the answers

How does increasing the number of open capillaries impact exchange within the capillaries?

It increases the average diffusion distance for exchange Signup and view all the answers

Sydney Medical School: Cardiovascular System Lecture 7 Quiz

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Questions and Answers

What is the primary role of capillaries in the microcirculation?

How does blood flow velocity differ from blood flow in the context of microcirculation?

Why does an increase in total surface area positively impact blood flow velocity?

What are the 3 ways substances are typically moved out of or into a capillary?

Which of the following roles does the lymphatic system play in regulating extracellular fluid volume?

What is the main function of capillaries in the human body?

Which vessel type is characterized by the presence of a high proportion of smooth muscle and is densely innervated by sympathetic nerves?

Why do capillaries have a slow flow rate?

What is the primary function of metarterioles in the microcirculation system?

How does increasing the number of open capillaries impact exchange within the capillaries?

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