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Questions and Answers
What is the primary function of arteries?
What is the primary function of arteries?
- Returning blood to the heart
- Regulating body temperature
- Exchanging gases with tissues
- Carrying blood away from the heart (correct)
Which statement accurately describes the pressure in veins compared to arteries?
Which statement accurately describes the pressure in veins compared to arteries?
- Veins have lower pressure than arteries. (correct)
- Veins have higher pressure than arteries.
- Veins have equal pressure to arteries.
- Veins do not have any pressure.
What occurs during the systole phase of the heartbeat?
What occurs during the systole phase of the heartbeat?
- Both atria contract simultaneously.
- The heart is relaxed and filling with blood.
- Blood is forced out of the ventricles. (correct)
- All heart valves are closed.
What role do valves in veins serve?
What role do valves in veins serve?
What is the order of blood flow during the diastole phase of the heartbeat?
What is the order of blood flow during the diastole phase of the heartbeat?
What distinguishes a closed circulatory system from an open circulatory system?
What distinguishes a closed circulatory system from an open circulatory system?
Which vessel type is primarily responsible for gas exchange?
Which vessel type is primarily responsible for gas exchange?
Which structural feature of arteries prevents them from over-expanding when subjected to high pressure?
Which structural feature of arteries prevents them from over-expanding when subjected to high pressure?
What is the primary function of veins in the circulatory system?
What is the primary function of veins in the circulatory system?
Which circuit of the circulatory system involves the transport of blood to and from the lungs?
Which circuit of the circulatory system involves the transport of blood to and from the lungs?
Flashcards
Blood pressure
Blood pressure
The force of blood against blood vessel walls, measured in millimeters of mercury (120/80 mmHg).
Artery function
Artery function
Carries blood away from the heart.
Vein function
Vein function
Carries blood towards the heart.
Diastole
Diastole
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Systole
Systole
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Open circulatory system
Open circulatory system
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Closed circulatory system
Closed circulatory system
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Artery structure
Artery structure
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Vein structure
Vein structure
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Capillaries
Capillaries
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Study Notes
Heartbeat
- Pulse: The alternating expansion and contraction of arteries, 72 bpm
- Blood pressure: The force exerted by blood against blood vessel walls, 120/80 mm
- Arteries: Carry blood away from the heart, high pressure, thick walls, small lumen, no valves
- Veins: Carry blood towards the heart, low pressure, thin walls, large lumen, valves prevent backflow
- Blood supply to heart: Coronary arteries and veins
Stages of Heartbeat
- Diastole: Heart is relaxed
- All atria and ventricles are relaxed
- Blood enters both atria
- All valves are closed
- Systole:
- Blood from atria to ventricles
- Sinoatrial (SA) node causes both atria to contract
- Bicuspid and tricuspid valves open to force blood into ventricles
- Semilunar valves are closed
- Blood leaves the heart
- The atria relax
- Atrioventricular (AV) node causes ventricles to contract
- Blood is forced out through the semilunar valves
- When all blood has left ventricles, semilunar valves close, end of cycle
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