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| Can the rate of Autorhythmic cells be modified by neural input? |
Yes. it is influenced by Sympathetic or Parasympathetic stimulation |
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auroracar Wed, 19 Nov 2008 03:49:33 GMT |
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| What would increasing K+ permeability do to the membrane potential of the cell? |
Hyperpolarize |
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auroracar Wed, 19 Nov 2008 03:49:33 GMT |
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| What determines heart beat rate? |
Frequency of A.P/activity of pacemaker cells |
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auroracar Wed, 19 Nov 2008 03:49:33 GMT |
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| what is the threshold for pacemaker potential? |
-40mV |
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auroracar Wed, 19 Nov 2008 03:40:57 GMT |
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| Do pacemaker cells generate their own AP? |
Yes |
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auroracar Wed, 19 Nov 2008 03:40:57 GMT |
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| Do pacemaker cells generate their own rhythm? |
Yes |
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auroracar Wed, 19 Nov 2008 03:40:57 GMT |
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| What is the pacemaker potential (b/c they don't have resting since they don't rest) start in mV? |
-60mV |
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auroracar Wed, 19 Nov 2008 03:40:57 GMT |
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| What is the other name for Myocardial Autorhythmic Cells? |
Pacemaker cells |
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auroracar Wed, 19 Nov 2008 03:14:27 GMT |
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| What is the mV for a resting membrane potential for a myocardial contractile cell? |
-90mV |
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auroracar Wed, 19 Nov 2008 03:14:27 GMT |
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| Can skeletal muscles exhibit summation and tetanus? |
Yes |
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auroracar Wed, 19 Nov 2008 03:14:27 GMT |
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| Who has a longer Refractory period? Skeletal or Cardiac muscle fiber? |
Cardiac muscle fiber |
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auroracar Wed, 19 Nov 2008 03:14:27 GMT |
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How can you prevent tetanus in the heart?
(sustained contraction) |
by the refractory period being as long as the contraction period allowing the heart to relax between contractions so the ventricles can fill with blood. |
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auroracar Wed, 19 Nov 2008 02:31:29 GMT |
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| The plateau in the Action Potential of a Myocardial Contractile cell is caused by what? |
Ca+ channels opening and : K+channels closing. |
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auroracar Wed, 19 Nov 2008 02:31:29 GMT |
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| Do Myocardial contractile cells need Ca2+ : |
Yes. they need Ca2+ to initiate contraction |
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auroracar Tue, 18 Nov 2008 23:43:51 GMT |
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Do Myocardial contractile cells have a :
T-tubules |
Yes |
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auroracar Tue, 18 Nov 2008 23:43:51 GMT |
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Do Myocardial contractile cells have a :
Mitochondria? |
Yes. Consumes 70-80%of the oxygen delivered to it by the blood. |
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auroracar Tue, 18 Nov 2008 23:42:51 GMT |
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| Do autorhythmic cells contribute to contribute to the contractile force of the heart? |
No. |
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auroracar Tue, 18 Nov 2008 23:42:51 GMT |
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| The signal for myocardial contraction comes from what? |
Autorhythmic cells or Pacemaker cells. |
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auroracar Tue, 18 Nov 2008 23:42:51 GMT |
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| Cardiac muscle cells contract with or without nervous stimulation? |
Without nervous stimulation |
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auroracar Tue, 18 Nov 2008 23:42:51 GMT |
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| Cardiac muscles have what hormonal influence? |
Epinephrine |
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auroracar Tue, 18 Nov 2008 23:24:45 GMT |
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| Do cardiac muscles have a fiber arrangement of sarcomeres? |
Yes |
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auroracar Tue, 18 Nov 2008 23:22:55 GMT |
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| Are cardiac muscles striated? |
Yes |
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auroracar Tue, 18 Nov 2008 23:22:55 GMT |
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| Do Cardiac muscle contain mitochondria? |
Yes |
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auroracar Tue, 18 Nov 2008 23:22:55 GMT |
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Ventricular muscle are arranged in what kind of arrangement?
This allows it to what? |
Spiral arrangement. Which allows ventricular contraction to squeeze the blood upward toward the apex. |
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auroracar Tue, 18 Nov 2008 23:22:55 GMT |
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| Gap junctions |
allow electrical signals to pass rapidly from cell to cell. |
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auroracar Tue, 18 Nov 2008 23:09:53 GMT |
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| Intercalated disks contain Desmosomes that do what? |
transfer force from cell to cell |
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auroracar Tue, 18 Nov 2008 23:09:53 GMT |
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| The chordae tendinae prevent |
the valve from being pushed back into the atrium |
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auroracar Tue, 18 Nov 2008 23:09:53 GMT |
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Cardiac muscle cells are also called?
Structure?
Attached to each other by? |
Myocardial muscle cells
Branched
Intercalated disks |
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auroracar Tue, 18 Nov 2008 23:02:41 GMT |
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| Semilunar valves prevent what? |
blood that has entered the arteries from flowing back into the ventricles during ventricular relaxation. |
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auroracar Tue, 18 Nov 2008 23:02:41 GMT |
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| What if there is a hole in the septum |
Deoxygenated and oxygenated blood mixing, less blood pumped into circulation by ventricles. |
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auroracar Tue, 18 Nov 2008 23:02:41 GMT |
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| What is a heart murmur? |
Unusual noises made by heart valves |
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auroracar Tue, 18 Nov 2008 23:02:41 GMT |
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| Superior and Inferior vena cava flow into what? |
Right Atrium |
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auroracar Tue, 18 Nov 2008 21:02:43 GMT |
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| Right side pumps into which circulation |
Pulmonary circulation |
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auroracar Tue, 18 Nov 2008 21:02:43 GMT |
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| Left side of heart pumps into which circulation |
Systematic Circulation |
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auroracar Tue, 18 Nov 2008 19:20:44 GMT |
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| systematic circulation |
takes blood away from the hearts |
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auroracar Tue, 18 Nov 2008 19:20:44 GMT |
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| pulmonary circulation |
takes blood to and from the lungs |
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auroracar Tue, 18 Nov 2008 19:20:44 GMT |
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| Cardiac output |
volume blood leaving either ventricle in time |
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auroracar Tue, 18 Nov 2008 19:20:44 GMT |
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| Velocity= |
V=Q(flow rate)/A(cross sectional area) |
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auroracar Tue, 18 Nov 2008 18:42:50 GMT |
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| Resistance |
1/r^4 |
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auroracar Tue, 18 Nov 2008 18:42:50 GMT |
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| Velocity |
length/time |
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auroracar Tue, 18 Nov 2008 18:42:50 GMT |
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| Flow rate |
mL/min |
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auroracar Tue, 18 Nov 2008 18:42:50 GMT |
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