The Heart

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  • Created by: Han2812
  • Created on: 28-01-14 11:25
What is an atrium?
A chamber that has thin muscular walls, elasticated to stretch to reach the blood. It only has to pump to the ventricles
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What is a ventricle?
A chamber that has much thicker walls than the atrium as it pumps the blood to the lungs or around the body
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What are the bicuspid and tricuspid valves?
Bicuspid valves are in-between the LEFT atrium and ventricle - 2 flaps. Tricuspid valves are in-between the RIGHT atrium and ventricles - 3 flaps
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What are the vessels on the LEFT side of the heart?
PULMONARY VEIN - Left Atrium - brings oxygenated blood back from the lungs, unusual for a vein to carry oxygenated blood. AORTA - Left Ventricle - carries oxygenated blood to body except lungs
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What are the vessels on the RIGHT side of the heart?
VENA CAVA - Right Atrium - brings deoxygenated blood back from tissues of the body. PULMONARY ARTERY - Right Ventricle - Carries deoxygenated blood to the lungs to get rid of CO2 and get O2, unusual for a artery to cary deoxygenated blood.
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What are the 3 stages in the Cardiac Cycle?
1) Atrial Systole 2) Ventricular Systole 3) Diastole
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What happens in stage 1 of the cardiac cycle?
1) Atrial Systole - atria walls contract, blood flows through AV valve into ventricle - 0.1s
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What happens in stage 2 of the cardiac cycle?
2) Ventricular Systole - ventricles contract, pressure rises - AV values shut (LUB). SL valves open, blood flows into artery 0.3s
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What happens in stage 3 of the cardiac cycle?
3) Diastole - atria + ventricular muscles relax, pressure on the blood drops, pressure in artery is now higher than ventricle. SL valves are pushed shut - preventing back flow of blood (DUB). As atria relaxes, blood flows in from the veins
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What is the Cardiac Output equation?
Cardiac Output (dm3 min-1) = Heart Rate x Stroke Volume
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How is the Cardiac Cycle Controlled?
Electric impulse from SAN (pacemaker) spreads across both atria - they contract. The AVN stops the wave reaching the ventricles, delay switch, so atria fully contract. Wave goes down the Bundle of His to the septum - ventricles contract from bottom
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Other cards in this set

Card 2

Front

What is a ventricle?

Back

A chamber that has much thicker walls than the atrium as it pumps the blood to the lungs or around the body

Card 3

Front

What are the bicuspid and tricuspid valves?

Back

Preview of the front of card 3

Card 4

Front

What are the vessels on the LEFT side of the heart?

Back

Preview of the front of card 4

Card 5

Front

What are the vessels on the RIGHT side of the heart?

Back

Preview of the front of card 5
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