Exam 3 Flashcards Preview

RUSVM Physiology I Red Summer 2016 > Exam 3 > Flashcards

Flashcards in Exam 3 Deck (7)
Loading flashcards...
1

What are the factors that have a positive influence on the increase of venous return in the short-term?

1. Cardiac Suction
2. Respiratory Pump
3. Skeletal Muscle Pump
4. Increase in sympathetic vasoconstriction activity
5. The driving pressure generated from cardiac contraction
6. Venous valves

2

What are the factors that have a positive influence on the increase of venous return in the long-term?

An increase in blood volume due to salt and water retention or a passive bulk flow shift of fluid from interstitial fluid into the plasma.

3

How does salt/water retention occur in the body with the result of an increase in venous return?

The renin-angiotensin-aldosterone system

4

How is blood pooling in the veins due to gravity remidied?

When moving from a lying position to a standing position, the mean arterial pressure drops stimulating a sympathetic response which causes vasoconstriction of the veins driving blood towards heart. In addition, skeletal muscle contractions "milk" the veins to move blood towards heart.

5

What type of cells are capillaries lined by?

Single layer of endothelial cells

6

General anesthetics and other materials that can diffuse through lipid bilayers of endothelial cells in capillaries are called __________ .

Lipophilic

7

What controls blood flow through the capillaries?

The precapillary sphincter; located at the origin..the only smooth muscle found on the capillary.