Exploring the Circulatory System: Heart and Blood Vessels

What does the term 'cardiovascular' refer to in the context of the circulatory system?

• Only the heart

• Only the blood vessels

• Neither the heart nor blood vessels

• Both the heart and blood vessels

Where is the heart typically located in the body?

• Center of the chest

• Slightly to the left in the mediastinum

• Directly behind the sternum

• Slightly to the right in the mediastinum

What is the function of the tricuspid valve in the heart?

• To pump blood to the lungs

• To prevent backflow into the left atrium

• To allow blood into the right ventricle

• To oxygenate the blood

What occurs in the capillaries of the lungs?

• Oxygen is expelled and carbon dioxide is absorbed

• Carbon dioxide is expelled and oxygen is absorbed

• Blood is pumped back to the heart

• Blood is cooled down

What is the primary function of systemic circulation?

• To transport nutrients to heart tissues

• To carry oxygenated blood to various body tissues

• To collect oxygen from the lungs

• To remove wastes from kidney

Which vessels carry blood back to the heart?

• Capillaries

• Veins

• Arteries

• Venules

What is the role of the tunica media in blood vessels?

• It provides a barrier to control blood flow

• It contains smooth muscle cells that regulate vessel diameter

• It transports oxygen

• It connects the blood vessel to nerve fibers

How do arteries differ from veins in terms of structure?

• Veins have valves; arteries do not

• Arteries and veins both have thick walls

• Neither arteries nor veins have valves

• Arteries have valves; veins do not

What is the function of capillaries in the circulatory system?

• To exchange gases and nutrients with tissues

• To regulate heart rate

• To pump blood

• To store blood

What happens during vasoconstriction?

• Blood vessels widen to increase blood flow

• Blood vessels narrow to decrease blood flow

• Blood pressure decreases

• Blood flow stops completely