Biology Chapter 9 Entry test MCQs
201. Ventricular systole requires about:
a. 0.1 sec
b. 1 sec
c. 0.3 sec
d. 0.8 sec
202. The second heart sound is produced by:
a. Closure of Semilunar valves
b. Closure of AV valves
c. Opening of Semilunar valves
d. Opening of AV valves
203. One complete heart beat consists of one systole and one diastole and lasts for about:
a. 0.2 sec
b. 0.8 sec
c. 0.5 sec
d. 0.4 sec
204. Which statement is correct about atrial systole?
a. Atria and ventricles are relaxed
b. Atria relax and ventricles contract
c. Ventricles remain relax while atria contract
d. Atria contract and ventricle also contract
Mechanism of Heart Excitation and Contraction
205. Heart cycle is naturally initiated by:
a. Battery
b. S.A node
c. Henson node
d. A.V node
206. The portion of heart which is always ready to be the pacemaker if SA node stops working:
a. Ventricle Muscles
b. Bundle branch
c. Atrial Muscles
d. AV node
207. The heart beat cycle starts when electric impulses are generated from:
a. SV Node
b. AV Node
c. PQ Node
d. SA Node
208. Which one of the following act as a pacemaker in heart?
a. Atria ventricular bundles of fibers
b. Atria ventricular node
c. Bundle of His
d. Sino-atrial node
209. In ECG, QRS complex represent:
a. Ventricle systole
b. Atrial systole
c. Ventricle diastole
d. Arial diastole
210. Atrial depolarization is represented by:
a. T wave
b. P wave
c. PORS
d. QRS Complex
211. The waves of ECG shows mainly:
a. Mechanical Events
b. Blood pressure
c. Chemical Events
d. Electrical Events
Blood Vessels
212. Arteriosclerosis is:
a. An infectious disorder
b. A metabolic disorder
c. A genetic disorder
d. A degenerative disorder
213. The only vein in the human body carrying oxygenated blood is:
a. Pulmonary
b. Femoral
c. Iliac
d. Renal
214. Which of the following blood vessels contain semilunar valves?
a. Veins
b. Arteries
c. Capillaries
d. Arterioles