Podcast
Questions and Answers
What influences arteriolar resistance according to the text?
What influences arteriolar resistance according to the text?
- Paracrine signals only
- CNS reflexes only
- Hormones only
- Local and systemic control reflexes (correct)
Which mechanism adjusts blood flow directly in arterioles?
Which mechanism adjusts blood flow directly in arterioles?
- CNS reflexes
- Hormones
- Sympathetic reflexes
- Myogenic autoregulation (correct)
What activates myosin light chain kinase (MLCK) in vascular smooth muscle?
What activates myosin light chain kinase (MLCK) in vascular smooth muscle?
- Sodium influx
- Potassium efflux
- Calcium influx
- Calmodulin (correct)
What does stretched vascular smooth muscle mechanically-gated Ca2+ channels result in?
What does stretched vascular smooth muscle mechanically-gated Ca2+ channels result in?
Which signals influence vascular smooth muscle?
Which signals influence vascular smooth muscle?
What influences arteriolar resistance in heart and skeletal muscle?
What influences arteriolar resistance in heart and skeletal muscle?
What determines blood distribution to various tissues according to the text?
What determines blood distribution to various tissues according to the text?
What does the sympathetic reflex regulate to meet homeostatic needs?
What does the sympathetic reflex regulate to meet homeostatic needs?
What causes fluid movement out of capillaries?
What causes fluid movement out of capillaries?
What causes fluid movement into capillaries?
What causes fluid movement into capillaries?
What is the net pressure determining the direction of bulk flow?
What is the net pressure determining the direction of bulk flow?
What is the function of the lymphatic system?
What is the function of the lymphatic system?
What is edema?
What is edema?
What is the role of lymph nodes?
What is the role of lymph nodes?
What causes net filtration at the arterial end of capillaries?
What causes net filtration at the arterial end of capillaries?
What causes net absorption at the venous end of capillaries?
What causes net absorption at the venous end of capillaries?
Which chemicals mediate vasoconstriction?
Which chemicals mediate vasoconstriction?
Which branch controls most vascular smooth muscle, except in the vasculature of erectile tissue?
Which branch controls most vascular smooth muscle, except in the vasculature of erectile tissue?
Which chemicals mediate vasodilation?
Which chemicals mediate vasodilation?
Where are the baroreceptors located that control blood pressure?
Where are the baroreceptors located that control blood pressure?
How do most capillary exchanges take place?
How do most capillary exchanges take place?
What is the main function of drugs used to treat erectile dysfunction?
What is the main function of drugs used to treat erectile dysfunction?
Which chemicals are potent vasodilators that play a role in inflammation?
Which chemicals are potent vasodilators that play a role in inflammation?
What controls blood distribution according to the metabolic need of individual tissues?
What controls blood distribution according to the metabolic need of individual tissues?
What is the relationship between capillary density and the metabolic activity of cells?
What is the relationship between capillary density and the metabolic activity of cells?
What is the main method of plasma and cell material exchange across capillary walls?
What is the main method of plasma and cell material exchange across capillary walls?
What is the function of the baroreceptor reflex?
What is the function of the baroreceptor reflex?
Which blood flow stays nearly constant according to the text?
Which blood flow stays nearly constant according to the text?
Study Notes
Vascular Physiology Overview
- Drugs used to treat erectile dysfunction prolong NO (nitric oxide) activity
- Nitric oxide decreases preeclampsia
- Kinins and histamine are potent vasodilators that play a role in inflammation
- Chemicals mediating vasoconstriction include norepinephrine, serotonin, endothelin, vasopressin, and angiotensin II
- Chemicals mediating vasodilation include epinephrine, acetylcholine, nitric oxide, bradykinin, adenosine, histamine, natriuretic peptides, and vasoactive intestinal peptide
- The sympathetic branch controls most vascular smooth muscle, except in the vasculature of erectile tissue
- Blood distribution varies according to metabolic need of individual tissues, governed by local control mechanisms and homeostatic reflexes
- Cerebral blood flow stays nearly constant
- The baroreceptor reflex controls blood pressure, with baroreceptors in carotid arteries and aorta producing continuous action potential to the brainstem
- Plasma and cells exchange materials across thin capillary walls, with capillary density related to the metabolic activity of cells
- Capillaries have the thinnest walls, and they are supported by basal lamina
- Most capillary exchange takes place by diffusion and transcytosis, including movement between endothelial cells and through cells, and transport of larger solutes and proteins by vesicular transport
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Description
Test your knowledge of vascular physiology with this quiz. Explore the role of various chemicals in vasoconstriction and vasodilation, the control of blood distribution, and the mechanisms of capillary exchange. See how well you understand the impact of drugs on nitric oxide activity and the function of the baroreceptor reflex in controlling blood pressure.
