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Physiology of theart
Stack #165146
| Question | Answer |
|---|---|
| How are atrial cells and ventricular cells different? | Atrial cells beat about 60 times/minute. ventricular cells beat 20-40 times. |
| Two types of controlling systems that help to regulate the contraction of the heart. | intrinsic: coordinates contraction. Nodal system causes heart muscle to depolarize from atria to ventricles |
| what happens during depolarization of a cell? | repolarization, muscle relaxes. Depolarization, muscle contracts. |
| Explain how the heart contracts | 1. SA node sends out an impulse through atrium. 2. atriums contract.3. AV node sends out impulse to ventricles. 4. delay 5. ventricles contract |
| Defibrillator | stops the uncoordinated shaking of the heart and allows it to pump normally |
| EKG | traces the flow of current through the heart : pqrs |
| what does p wave indicate? | contraction |
| what does the qrs complex indicate? | that the ventricles have been depolarized |
| What does the T wave indicate? | relaxation/repolarization of the ventricles. |
| what happens to the muscles in the atrium during atrial depolorization? | muscles contract |
| What happens to the muscles in the ventricle during ventricular depolarization? | muscles contract |
| what happens tot he muscles in the ventricle during ventricular repolarization? | muscles relax |
| what are four examples of vital signs | arterial pulse, blood pressure, respiratory rate, body temperature. |
| what is a pulse | the altering expansion and recoil of an artery that occurs when heart contracts |
| why is a pulse measured from the beat of the left ventricle and not the right? | left=blood goes to body. right= blood goes to the lungs |
| why would a change in posture effect your pulse? | gravity is pulling in different direction |
| define blood pressure | pressure blood puts on blood vessels |
| why does blood pressure decrease from the aorta to the venae cavae? | source of pressure. venae cavae is the furthest possible point from the left ventricle. |
| if there is not enough blood pressure to get blood back to the heart, how does it get back to the heart? | valves in veins, movement, breathing, recoil of vessels. |
| describe the differences between the two measurements of blood pressure. | systolic= contraction. diastolic= relaxing |
| neutral factors | resonses: sympathetic: fight/flight bp up parasympathetic- rest/digest bp down |
| renal factors | kidney- increases h2o in blood. bp up decrease h2o in blood bp down |
| temp. | cold bp up hot bp down |
| chemicals | nicotine: contrictor: bp up alcohol; bp down |
| diet | salt/fat bp up |
Created by:
kaityftz09
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