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Terms in this set (44)
The AV valves and semilunar valves are closed.
systolic and diastolic blood pressure
- Systolic blood pressure (the top number) measures the amount of pressure that blood exerts on vessels while the heart is beating.
- Diastolic blood pressure (the bottom number) measures the pressure in your vessels between heartbeats.
measures blood pressure
5 types of blood vessels
1. arteries 2. arterioles 3. capillaries 4. venules 5. veins
blood vessels that carry blood AWAY from the heart
Small vessels that receive blood from the arteries
tiny vessels that join arterioles and venules
small vessels that gather blood from the capillaries into the veins
blood vessels that carry blood back to the heart
a double-layered serous membrane that surrounds the heart
the innermost of the two layers of the pericardium
the middle muscular layer of the heart wall
inner lining of the heart
contract when ventricles contract to prevent AV valves from opening
the amount of blood pumped out by the ventricles in a given period of time
a short sinus receiving most of the veins of the heart
the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next
record of the electrical activity of the heart
the volume of blood pumped out by a ventricle with each heartbeat
carries blood to the lungs for gas exchange and returns it to the heart
Circuit of blood that carries blood between the heart and the rest of the body.
the two upper chambers of the heart- the receiving areas that pool incoming blood.
ear-like projections, sensitive to chemicals and touch
the two lower chambers of the heart, and they pump blood out to the lungs and body.
the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery
the widening of the chambers of the heart between two contractions when the chambers fill with blood
cardiac conduction system
fibers of cardiac muscle tissue which distribute impulses over the entire heart
sinoatrial node (pacemaker of the heart)
a specialized bit of heart tissue that controls the heartbeat
picks up electrical impulse from the SA node and causes ventricles to contract, causing blood to move into arteries
group of fibers which receive impluse from the atrioventricular node; also known as the bundle of His
fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
cardiac conduction steps
1: sinoatrial (SA) node fires (the pacemaker)
2: excitation speeds through atrial myocardium
3: atrioventricular node fires
4: excitation speeds through AV bundle
5: purkinge fibers distribute excitation though ventricular myocardium
smallest group of blood vessels
veins vs arteries
*Veins - Carry blood to the heart.
*Arteries - Carry blood away from the heart
flaps in front of atria
only artery that carries deoxygenated blood
inner open space of a tubular organ
increase of volume of blood
large vessels in front of heart that lie in front of aorta
where does blood go after leaving right ventricle
aorta, then rest of body
disease of arteries causes fatty deposits of cholesterol in arteries
tendons that connect valve to muscles of heart
arteries that supply blood to legs
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