1. What does vasoconstriction or vasodilation do to venous return and cardiac output? How does this...

1. What does vasoconstriction or vasodilation do to venous return and cardiac output? How does this occur?

2. How would viscosity change as the number of red blood cells increase or decrease?

3. Give an example of when the size of a blood vessel's lumen would change.

4. Would vasoconstriction or vasodilation make the lumen smaller? What happens to the resistance when the lumen gets smaller? What happens to blood pressure?

Expert Solution

1. ANSWER: Vasoconstriction increases the pressure on the veins as it does in an artery. But, vasoconstriction in arteries would decrease the blood flow whereas vasoconstriction in veins would increase the flow hence the venous return to the heart also increases. In vasodilation, the venous return would decrease as the pressure on the veins decreases.

2. ANSWER: Increased red blood cells would increase the hemotocrit hence the viscosity of the blood would increase. Blood viscosity depends on the hematocrit. Decreased blood cells would also slightly decrease the viscosity of the blood.

3. ANSWER: Decrease blood vessel size would be due to temperature decrease, increased Po2, angiotensin, vasopressin, thromboxane A2.

Blood vessel increase is due to temperature increase, decreased Po2, PGI2, bradykinin.

4. ANSWER: Vasoconstriction would make the lumen smaller and vasodilation make the lumen bigger. Vasoconstriction would increase the pressure on the walls and thus Increases the blood pressure.

Sydney Mullin answered 1 year ago

1. Explain the effects of pressure,resistance, and venous return on cardiac output? 2. Describe how cardiovasculr...

1. Explain the effects of pressure,resistance, and venous return on cardiac output? 2. Describe how cardiovasculr Regulatory Mechanisms respond to changes in blood pressure and blood chemistry? (This answer must include how the ANS, endocrine system, baroreceptors, chemoreceptors, all work wirh the cardiovascular system)

How does hormonal control of glomerular flow rate affect cardiac output?

Define cardiac output. How can the resting cardiac output of a young, healthy, and active 25...

Define cardiac output. How can the resting cardiac output of a young, healthy, and active 25 year old be the same value as a young, healthy, inactive 25 year old? Explain your answer

What compensatory measures does the body employ in an attempt to restore cardiac output? What are...

What compensatory measures does the body employ in an attempt to restore cardiac output? What are the effect of these compensatory measures?

Which factors affect cardiac output? What types of changes in cardiac output can be made to...

Which factors affect cardiac output? What types of changes in cardiac output can be made to try and treat hypertension and congestive heart failure? Many classes of drugs affect cardiac output, which one is in JNC 8 protocol.

1. What happens to reabsorption at the capillaries as hydrostatic pressure changes? 2. If venous return...

1. What happens to reabsorption at the capillaries as hydrostatic pressure changes? 2. If venous return to the heart decreases, what happens ro cardiac output and why? 3. How does thw autonomic nervous system system affect blood pressure? 4. What are baroreceptoes? Where are they located? How do they work?

During exercise, how/why does a larger percentage of blood (cardiac output) go to skeletal muscles?

-How does the body respond to blood loss? (hormones, nervous system, cardiac output and contractility, heart...

-How does the body respond to blood loss? (hormones, nervous system, cardiac output and contractility, heart rate, blood vessels) What causes death from hemorrhagic shock?

What effect do beta-blockers have on cardiac output and hemodynamics? Which specific structures do these medications affect?

1. What does the following program do? 2. What output does the program produce? 3. Examine...

1. What does the following program do? 2. What output does the program produce? 3. Examine the program code carefully. Is the program functioning correctly? 4. If you do not think the program is working correctly, describe why? 5. Include one screenshot of the program's output. C++ PROGRAM: #include <iostream> #include <pthread.h> #include <stdlib.h> int count; void* myFunction(void* arg) { int actual_arg = *((int*) arg); for(unsigned int i = 0; i < 10; ++i) { count++; std::cout << "Thread...

Question