Which of the following is associated with a decrease in cardiac output?

1. Sympathetic nerves

2. Parasympathetic neural signals

3. Pneumotaxic center

4. Adrenal medullary hormones

Given below are four statements (a-d) regarding human blood circulatory system:
 

Which two of the above statements are correct?

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (a) and (d)

Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

Arterial blood pressure in human beings is:
1.  120 and 80 mm Hg
2.  150 and 100 mm Hg
3.  50 and 100 mm Hg
4.  None of the above

Ventricular contraction is in command of :
1.  S.A. Node
2.  A.V. Node
3.  Purkinje fibers
4.  Papillary muscles

At which point, the pulmonary artery is different from the pulmonary vein:
1. Its lumen is broad
2. Its wall is thick
3. It has valves
4. It does not possess endothelium

Incomplete double circulation occurs in

1. Fishes

2. Amphibians

3. Reptiles

4. Both 2 & 3

Open circulatory system is present in

1. Arthropods

2. Molluscs

3. Annelids

4. Both 1 & 2

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

1. Rh antigen

2. Rh antibodies

3. Agglutinins

4. ABO antibodies

Oxygen carrier in human blood is 

1.  Carbonic anhydrase

2.  Haemoglobin

3.  Haemocyanin

4.  Both (1) & (3)