List the two types of vessels that make-up a capillary bed. Answer: True capilla

Question

List the two types of vessels that make-up a capillary bed. Answer: True capillary - which branch from arterioles and provide exchange between cells and the blood 2). Short capillary that directly connect the arterioles and venules at opposite ends of the beds, metarterioles, only found in the mesenteric circulation. b. Provide the function of each type of vessels.| c. What controls where the blood will go in a capillary bed? d. What are precapillary sphincters? e. What is the effect of precapillary sphincters on tissue perfusion? f. A relaxed sphincter will ____, which is termed ____. This will cause blood to flow through the ____. g. A contracted sphincter will ____, which is termed ____. This will cause blood to flow through the ____. h. If a cell is metabolically active or at rest, what is the state of precapillary sphincters? Which type of blood vessel contains the greatest percentage of your blood? What allows this vessel to hold more blood? What determines velocity? a. Which blood vessel has the slowest velocity of blood flow? b. What is the advantage of having slow blood flow at this site and fast flow in other vessels? Blood Flow a. Define b. What are the units of blood flow? c. write the equation for blood flow. d. How would an increase or decrease in pressure affect blood flow? e. How would an increase or decrease in resistance affect blood flow? Peripheral Resistance a. Define b. What are the units of resistance? c. List the three important sources of resistance, and describe how they change resistance. d. Which factor has the greatest impact on vessel resistance? e. How would an increase or decrease in blood viscosity affect peripheral resistance, blood

Explanation / Answer

b. 1. Large arteries are divided into small vessels called arterioles. Arterioles ends in capillaries to carry all necessary materials (glucose and oxygen etc.) to each and every cell.

2. Venules originates from capillary bed. They collect wastes produced from cells during metabolism. They collect wastes and CO2 from cells.

c. In the capillaries certain blood pressure and muscular contraction are maintained to pump and receive blood in arterioles and venules.

d. Capillary sphincter is a band that adjusts blood flow into capillaries (mesenteric circulation). This band is a type of smooth muscle. This can open and close the entrance of capillary.

e. Precapillary sphincters controls exchange of flued between the capillaries and body tissues.

f. A relaxed spincter will close blood vessel which is termed as vascular shunt. This will cause blood to flow to throghfare channel.   

g. A contracted sphincter will open blood vessel which is termed as vascular shunt. This will cause blood to flow through the capillaries.

h. If a cell is metabolically active they open, if they are inactive they are closed.

8. Arteries and arterioles have more percentage of blood. Blood pressure holds more blood in arteries and arterioles.

9. Blood pressure and elasticity of blood vessels determine the velocity of blood. Capillaries and venules have slowest velocity of blood.

10. a. Blood flow is flow blood in circulatory system. It ensures the transport of nutrients, oxygen, carbon dioxide, hormones, metabolic wastes etc.

b.The units for blood flow is cm/S.

c. The equation for blood is PI(Pulsatility Index) = V systole - V diastole/ V mean.

11. Peripheral resistance is the resistance of arteries blood flow. When arteries contract the resistance increase, when dilate resistance decrease.

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