Oxygen carrier in human blood is 

  •   Carbonic anhydrase

  •   Haemoglobin

  •   Haemocyanin

  •   Both (1) & (3) 

Erythroblastosis foetalis occurs when a factor from mother passes into the foetus through the placenta. The factor is 

  • Rh antigen

  • Rh antibodies

  • Agglutinins

  • ABO antibodies

Open circulatory system is present in

  • Arthropods

  • Molluscs

  • Annelids

  • Both 1 & 2

Incomplete double circulation occurs in

  • Fishes

  • Amphibians

  • Reptiles

  • Both 2 & 3

Which of the following conditions causes erythroblastosis fetalis?

  • Mother Rh+ve and fetus Rh-ve

  • Mother Rh-ve and fetus Rh+ve

  • Both mother and fetus Rh-ve

  • Both mother and fetus Rh+ve

Persons with 'AB' blood group are called as "Universal recipients". This is due to:

  • Presence of antibodies, anti-A and anti-B, on RBCs

  • Absence of antibodies, anti-A and anti-B, in plasma

  • Absence of antigens A and B on the surface of RBCs

  • Absence of antigens A and B in plasma

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

  • Epinephrine

  • Thrombokinase

  • Thrombin

  • Renin

Which of the following values will not be normal for a healthy person?
 
  • 10 gms of haemoglobin per 100 ml of blood
  • 5 million RBC per mm3
  • 7000 WBC per mm3
  • 200000 platelets per mm3
If an Rh –ve mother is carrying an Rh +ve foetus, she is likely to be exposed to the Rh antigen:
 
  • At the time of implantation of the blastocyst
  • At the time when the placenta becomes functional
  • When the first movements of the baby can be felt
  • At the time of delivery
The stroke volume of left ventricle in a person is 75 ml. His cardiac output is 6000 ml. What will be his heart rate?
 
  • 72 per minute
  • 75 per minute
  • 80 per minute
  • 100 per minute
During the ventricular systole:
I. The atria also undergo systole
II. The atrioventricular valves get closed
III. The semilunar valves are forced open
  • Only I and II are correct
  • Only I and III are correct
  • Only II and III are correct
  • I, II and III are correct
Thrombokinase:
  • is an enzyme formed in and secreted by the platelets
  • is an enzyme complex required to convert prothrombin into thrombin
  • dissolves the intravascular clots
  • prevents coagulation of the blood
What is incorrect regarding human heart?
  • It is neurogenic
  • It is derived from embryonic mesoderm
  • It is a muscular pump
  • It is located in thorax between the lungs
A cardiovascular centre that can moderate the cardiac function through the autonomic neural system is located in the:
  • Pons varoli
  • Medulla oblongata
  • Hypothalamus
  • Cerebrum
The cell shown in the given diagram:
  
  • is a bone marrow stem cells committed to produce RBCs
  • is the megakaryocyte
  • is the commonest WBC and is phagocytic
  • is responsible for acquired immunity in humans
Consider the given two statements:
I. SA node is the natural pacemaker of the human heart.
II. SA node is the only part of that nodal musculature that is auto-excitable.
  • Only I is correct
  • Only II is correct
  • Both I and II are correct
  • Both I and II are incorrect
An increase in the ventricular pressure during ventricular systole leads first to:
  • closure of tricuspid and bicuspid valves
  • opening of aortic and pulmonic semilunar valves
  • opening of tricuspid and bicuspid valves
  • Closure of aortic and pulmonic semilunar valves
Consider the given two statements:
I. The type of antigen present on the RBCs of a person with blood group type A is A
II. The type of antibodies present in the plasma of a person with blood group type A is anti-A
 
  • Only I is correct
  • Only II is correct
  • Both I and II are correct
  • Both I and II are incorrect
Cardiac output can be increased by:
I. Neural signals through sympathetic nerves
II. Neural signals through parasympathetic nerves
III. Adrenal medullary hormones
 
  • Only I and II
  • Only I and III
  • Only II and III
  • I, II and III
Two heart sounds are normally produced during a cardiac cycle. The first of these is produced due to the:
 
  • simultaneous opening of atrio-ventricular valves 
  • simultaneous opening of semilunar valves 
  • simultaneous closure of semilunar valves
  • simultaneous closure of atrio-ventricular valves
Match each item in Column I with one in Column II and select the correct match from the codes given:
COLUMN I COLUMN II
A Heart failure P The heart stops beating
B. Cardiac arrest Q Heart not pumping blood, effectively enough, to meet the needs of the body
C. Heart attack R Heart beats more slowly or with an abnormal rhythm
D. Heart block S Heart muscle is suddenly damaged by an inadequate blood supply
 
Codes:
A B C D
1. Q P S R
2. P Q S R
3. P Q R S
4. S R P Q

 
  • 1
  • 2
  • 3
  • 4
During the coagulation of blood:
 
  • Fibrinogen is activated by the enzyme plasmin
  • Prothrombin is activated by the enzyme fibrinolysin
  • The basophils release certain factors which activate the mechanism of coagulation
  • Calcium ions play a very important role
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Practice Zoology Quiz Questions and Answers