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The Heart

alposey

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Across
6.Vessels which carry blood away from the heart
8.Amount of blood pumped by each ventricle
9.Middle layer of the heart
12.Phase of a heartbeat, when pressure in the ventricles drops until atrioventricular valves open and blood flows into ventricles
14.Receptors which detect CO2 levels
15.Primary type of metabolism used by cardiac cells
17.Direct connection between the pulmonary artery and aorta in fetal circulation
19.Direct connection between right and left atriums in fetal circulation
22.Valve between the left atrium and left ventricle
23.Membrane surrounding the heart
26.Receptors which detect pressure
27.Heart circuit which transports blood to and from the lungs
28.Heart circuit which transports blood to and from the body
29.Connection of cytoplasm between two cells to help synchronize contraction
30.Stage of contraction when calcium begins to enter cell and potassium begins to leave cell
31.Lower chambers of the heart
Down
1.Phase of a heartbeat when contraction occurs
2.Innermost layer of the heart
3.Valve between the right ventricle and pulmonary trunk
4.Cells which fire action potentials to trigger rhythmic heart contraction
5.Mechanical connection between cells to prevent separation during contraction
7.Vessels which carry blood toward the heart
10.Clump of myocardial conducting cells known as the pacemaker of the heart
11.Stage of contraction when rapid Na+ influx causes membrane potential to increase to +30mV
13.Valve between the left ventricle and aorta
15.Upper chambers of the heart
16.Stage of contraction when rapid outflow of potassium re-establishes a resting potential
18.Outer layer of the heart
20.Vessels which carry blood to and from the myocardium
21.How fast the heart beats
24.Valve between the right atrium and right ventricle
25.Stage when a new contraction cannot occur until relaxation has occured
27.Fibers which conduct nerve impulses through the myocardium of the ventricles

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