Cardiac muscle contracts due to______________?

Related Mcqs:

1. Which of the following cardiac depressants is contraindicated in a patient with cardiac arrhythmia____________?

   A. Lidocaine
   B. Quinidine
   C. Phenytoin
   D. Propranolol

2. Among the muscles of TMJ the following muscle opposing stabilizing and antagonistic muscle force as far as the disc is concerned_____________?

   A. Medial pterygoid
   B. Temporalis
   C. Lateral pterygoid
   D. External pterygoid

3. Cavity formation in a tooth, due to dental caries is due to______________?

   A. Destructive potential of streptococcus mutans
   B. Destructive potential of lactobacillus acidophilus
   C. Lateral spread of caries along DE junction and weakening of the outer covering enamel
   D. Mastectomy force and unrelated to the extent of carious process

4. Cardiac output is not affected by __________________?

   A. Heart rate
   B. Peripheral resistance
   C. Systolic blood pressure
   D. Venous return

5. All the heart valves are open during which stage of cardiac cycle __________________?

   A. Systolic ejection
   B. Isovolumetric relaxation
   C. Isovolumetric contraction
   D. None of the above

6. Under resting condition the cardiac output is _______ L/ min ?

   A. 2.5
   B. 4.25
   C. 5.25
   D. 9.5

7. The following factors increase the cardiac output except______________?

   A. Preload
   B. After load
   C. Heart rate
   D. Myocardial contractility

8. Cardiac output is a measure of______________?

   A. Peripheral resistance X tissue fluid
   B. Peripheral resistance X cardiac rate
   C. Blood pressure X cardiac rate
   D. Heart rate X blood volume

9. Cardiac index is related to ______________?

   A. cardiac output and body weight
   B. Cardiac output and body surface area
   C. Cardiac output and work of the heart
   D. Stroke volume and pulse rate

10. Cardiac cycle duration in man is_______________?

    A. 0.4 seconds
    B. 0.8 seconds
    C. 1.2 seconds
    D. 1.6 seconds