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Stack #211155
| Question | Answer |
|---|---|
| Each of the cardiac valves: (a) opens and closes in response to changes in pressure (b) attatches to the ventricular walls via chordae tendinae (c) ensures one-way blood flow through the heart. (d) a & c (e) All of the above | e) all of the above |
| Name the blood flow from the lower body through the heart to the left atrium | 1. inferior vena cava 2. right atrium 3. tricuspid valve 4. right ventricle 5. pulmonary valve 6. pulminary trunk and arteries 7. lungs 8. pulminary veins 9. left atrium |
| All are true of circulation of blood are true but: (a)sys. circulation circ. recieves blood from left ventricle(b)pulm. circ. trans. blood from heart to lungs & back to heart(c)1st blood vessel in sys.circ.is aorta(d)cor.ciruc.part of pulm. circ. | (d) The coronary circulation is part of the pulmonary circuit |
| The autrohythmic cells of the heart:(a)constitute approx.90% cardiac myofibers(b)depolarize to threshold spontaneously(c)depolarize slower then other cardiac myofibers(d)are found in the birous skeleton of heart(e)depolarize only in response to nerotrans. | d) ? |
| Cardiac action potentials propagate through the conduction of what sequence? | 1. SA node 2. AV node 3. AV bundle 4. right and left bundle branches 5. Purkinje fibers |
| What events occur during the plateau phase of a cardiac contractile action potential and in what order they occur during that phase. | 1. opening of voltage-gated slow Ca2+ channels 2. entry of Ca2+ from the interstitial fluid 3. release of Ca2+ from the sarcoplasmic reticulum |
| The QRS complex of the ECG is associate with (a) atrial depolarization (b) ventricular depolarization (c) SA node depolarization (d) ventricular repolarization (e) A & B | b) ventricular depolarization |
| Which correlations between cardiac contractions & ECG waves is correct? (a)Atrial systol persists through S-T segment(b)All chambers are contracted during period between Twave and next Pwave(c)Vent. sytole begins after QRS | c) ventricular systol begins after the QRS complex appears. |
| What is the interval called when cardiac fibers are contracting but not shortening. intraventricular pressure increases but volume is same(a)atrial systol (b) atrail diastol (c) ventricular diastole (d) isovolumetric relaxion (e) isovolumetric contraction | e) isovolumetric contraction |
Created by:
steph12785