Question 5 Match the following terms describing electrical events with the corre

Question

Question 5 Match the following terms describing electrical events with the correct phases of the cardiac cycle The QRS complex directly preceeds this phase. A. isovolumetric contraction During this phase, Na+ entry through the funny channels causes the pacemaker B. ventricular filling potential of SA nodal cells to gradually become less negative until it reaches threshold C. isovolumetric relaxation D. ventricular ejection The beginning of this phase corresponds with the T wave and the repolarization of the ventricle. The cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase.

Explanation / Answer

1 - D

The QRS complex represents ventricular depolarization.

2. - B

3. - C

4. - A

Aeterial blood vessels provides most of the variationof peripheral blood resistance

effect of blood flow during exercise:

it depends upon the need of the tissue

skin: blood flow increases- skin turns a red or pinkish color, and a great deal of excess heat is lost as blood flows through the diilated blood vessels

Brain: blood flow decrease - drop in your brain’s oxygen levels will reduce its ability to properly coordinate your muscles and will contribute to symptoms of exercise fatigue.

Kidney: blood flow decreases - because large fraction of blood shunted to the skeletal muscles and there is reduction of blood flow in other tissues.

Heart: Decreases-due to constriction of vessels. So heart rate increases in order to pump more blood.

Stomach - decreased blood flow- blood goes to skeletal muscle instead of stomach.

Skeletal muscle: increases because the blood vessels in your muscles dilate during exercise while brain signals other tissue vessels to constrict and hence more blood is diverted to the skeletal muscle and the blood flow is greater

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.