Biology - Mock Test 64

Question 631

Thromboplastin required for blood clotting at the place of injury is released by?

A) blood platelets B) eosinophils C) neutrophils D) lymphocytes

---

No Details

Question 632

Thickest part of human heart is?

A) Right atrium B) left atrium C) Right ventricle D) left ventricle

---

No Details

Question 633

The sequence of cardiac cycle is?

A) Atrial systole – Ventricular systole – Joint diastole B) Diastole – Atrial systole – Ventricular diastole C) Atrial systole – Ventricular diastole – Ventricular diastole D) Ventricular diastole – Diastole – Ventricular systole – Atrial systole

---

No Details

Question 634

The role of pacemaker in heart is to?

A) initiate heart beat B) control blood pressure C) control atherosclerosis D) purify blood

---

No Details

Question 635

The opening of inferior vena cava into right auricle is regulated by?

A) Semilunar valve B) Valve of Thebesius C) Eustachius valve D) none of the above

---

No Details

Question 636

The impulse generating (pacemaker) tissue located in the right atrium of the heart is?

A) SA node B) AV node C) Bundle of His D) Purkinje fibres

---

No Details

Question 637

The heart muscles are?

A) Striated and voluntary B) Striated and involuntary C) Smooth and voluntary D) Smooth and involuntary

---

No Details

Question 638

Systolic pressure is 120 mm Hg and diastolic pressure is 80 mm Hg, the pulse pressure is?

A) 120 x 80 = 9600 mg Hg B) 120 + 80 = 200 mm Hg C) 120 – 80 = 40 mm Hg D) 120 / 80 = 1.5 mm Hg

---

No Details

Question 639

Systolic pressure in adult human is?

A) 120 mm Hg B) 120/80 mm Bg C) 150/120 mm Hg D) 80 mm Hg

---

No Details

Question 640

Systole Is contraction of?

A) A V node B) SA node C) Major arteries D) Atria and ventricles

---

No Details