vascular system

What are the key functions of the vascular system?

Circulates blood through systemic and pulmonary circulation, facilitates nutrient, oxygen, carbon dioxide, and waste exchange, and returns deoxygenated blood to the heart for reoxygenation.

What is the main difference between arteries and veins?

Arteries carry blood away from the heart and have thicker tunica media, while veins direct blood back to the heart, have valves to prevent backflow, and are larger with thinner walls.

What layers are present in blood vessels?

The three layers are Tunica Intima (innermost), Tunica Media (middle), and Tunica Externa (outermost).

What is the function of capillaries?

Capillaries facilitate efficient nutrient and gas exchange, allowing red blood cells to pass through one at a time.

What role do baroreceptors play in short-term blood pressure regulation?

Baroreceptors detect blood vessel stretch and send signals to the cardiovascular center, adjusting heart rate and cardiac output to regulate blood pressure.

What is the function of epinephrine and norepinephrine in long-term blood pressure regulation?

These hormones increase heart rate, force of contraction, and cause vasoconstriction in some vessels while promoting vasodilation in skeletal muscle.

What hormone causes powerful vasoconstriction and stimulates thirst?

Angiotensin II.

What is the role of Aldosterone in blood pressure regulation?

Aldosterone increases sodium reabsorption in the kidneys, leading to water retention and increased blood volume.

How does Atrial Natriuretic Peptide (ANP) affect blood pressure?

ANP reduces blood pressure by promoting vasodilation and increasing urine output, thereby lowering blood volume.

What is the significance of the vascular system's structure regarding blood flow?

The structure, including tunics and lumen size, affects resistance, elasticity, and overall blood flow efficiency in the body.