Regulating Peripheral Resistance - Part 1

In this episode, Leslie Samuel discusses peripheral resistance, a key factor in the cardiovascular system. He explains how blood flow encounters resistance due to friction with blood vessel walls and how this resistance can be regulated. The focus is on arterioles, which can constrict or dilate to change resistance levels. Hormones like epinephrine and norepinephrine play roles in vasodilation and vasoconstriction, affecting peripheral resistance and mean arterial pressure. The episode also covers the impact of atherosclerosis, where plaque buildup increases resistance and blood pressure. Leslie concludes with health advice to maintain a healthy lifestyle.

What is the primary function of the heart in the circulatory system?

• To filter blood

• To pump blood throughout the body

• To store blood

• To produce blood cells

What is peripheral resistance primarily caused by?

• The elasticity of the heart

• The amount of blood in the body

• Friction between blood and vessel walls

• The size of the heart

Which type of blood vessel is most involved in regulating peripheral resistance?

• Aorta

• Arterioles

• Capillaries

• Veins

How does constriction of arterioles affect peripheral resistance?

• It only affects blood pressure

• It increases peripheral resistance

• It has no effect on peripheral resistance

• It decreases peripheral resistance

Which hormone can act as both a vasoconstrictor and a vasodilator?

• Insulin

• Glucagon

• Epinephrine

• Cortisol

What is the role of beta 2 receptors in the action of epinephrine?

• They increase blood viscosity

• They lead to vasodilation

• They activate calcium release

• They cause vasoconstriction

What effect does norepinephrine have on peripheral resistance?

• It has no effect on peripheral resistance

• It only affects heart rate

• It increases peripheral resistance

• It decreases peripheral resistance

What is atherosclerosis characterized by?

• Decreased blood pressure

• Plaque buildup in arteries

• Increased heart rate

• Increased blood cell production

How does atherosclerosis affect peripheral resistance?

• It only affects heart rate

• It has no effect on peripheral resistance

• It increases peripheral resistance

• It decreases peripheral resistance

What lifestyle change can help prevent increased peripheral resistance?

• Reducing physical activity

• Avoiding all carbohydrates

• Increasing cholesterol intake

• Maintaining a healthy diet and exercise