Blood Vessels

Which type of blood vessels take blood away from the heart?

• Arteries

• Veins

• Capillaries

• Venules

What is the primary function of capillaries?

• Transporting blood to the heart

• Exchanging nutrients, gases, and wastes with surrounding tissues

• Pumping blood out of the heart

• Controlling blood pressure

What happens to blood vessels during vasoconstriction?

• They widen

• They narrow

• They remain the same size

• They burst

Which layer of blood vessels is primarily made of smooth muscle and helps control vessel size?

• Tunica Intima

• Tunica Media

• Tunica Adventitia

• Endothelium

What is the main characteristic of veins compared to arteries?

• Thicker walls

• Thinner walls

• No walls

• Same thickness as arteries

What is the role of the autonomic nervous system in controlling blood vessels?

• It controls the diameter of blood vessels through smooth muscle contraction and relaxation.

• It controls the diameter of blood vessels through skeletal muscle contraction and relaxation.

• It controls the diameter of blood vessels through bone contraction and relaxation.

• It controls the diameter of blood vessels through nerve contraction and relaxation.

What is the outermost blood vessel layer called?

• Tunica Intima

• Tunica Media

• Tunica Adventitia

• Tunica Externa

Which type of blood vessel has a thicker wall and higher pressure?

• Veins

• Arteries

• Capillaries

• Venules

What is the function of the smooth muscle in the tunica media?

• To provide structural support

• To influence blood flow and blood pressure

• To anchor the blood vessels

• To provide a smooth lining for blood flow

What percentage of the body's blood volume do veins hold?

• 30-40%

• 50-60%

• 65-70%

• 80-90%