Unit 2 - Circulatory - Blood vessels

What is the main difference between veins and arteries?

• Veins have thinner walls than arteries
• Veins have more elastic tissue than arteries
• Veins carry oxygenated blood while arteries carry deoxygenated blood
• Veins have thicker tunica interna and media than arteries

What is the main function of veins?

• To filter blood
• To transport oxygen
• To return blood to the heart
• To store blood

What is the thickest tunic in veins?

• Tunica interna
• Tunica externa
• Tunica media
• None of the above

What is the pressure exerted on the walls of a blood vessel?

• Vascular resistance
• Blood flow
• Cardiac output
• Blood pressure

What is the opposition to blood flow as a result of friction between blood and the walls of the blood vessels?

• Blood pressure
• Blood flow
• Vascular resistance
• Cardiac output

What is the relationship between the velocity of blood flow and the cross-sectional area of blood vessels?

• No relationship
• Inversely proportional
• Directly proportional
• Randomly proportional

What is the group of neurons in the medulla oblongata that regulates heart rate, contractility, and blood vessel diameter?

• Cardiovascular center
• Endocrine center
• Respiratory center
• Digestive center

What are the sensory receptors that monitor stretching of the walls of blood vessels and the atria?

• Chemoreceptors
• Thermoreceptors
• Baroreceptors
• Proprioceptors

What is the function of the sympathetic division in blood vessel walls?

• To decrease heart rate
• To promote vasoconstriction
• To promote vasodilation
• To increase heart rate

What is the function of the parasympathetic division in heart rate?

• To increase heart rate
• To promote vasoconstriction
• To decrease heart rate
• To promote vasodilation