Flashcards in Exam 3 Deck (7)
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
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.
How does salt/water retention occur in the body with the result of an increase in venous return?
The renin-angiotensin-aldosterone system
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.
What type of cells are capillaries lined by?
Single layer of endothelial cells
General anesthetics and other materials that can diffuse through lipid bilayers of endothelial cells in capillaries are called __________ .