how many contraction nodes are found in heart of rabbit

Releted Question 1

Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature?
(1) They do not need to reproduce
(2) They are somatic cells
(3) They do not metabolize
(4) All their internal space is available for oxygen transport

A. only (1)

B. (1), (3) and (4)

C. (2) and (3)

D. only (4)

Releted Question 2

A. reduce the rate of heart beat

B. reduce the blood supply to the brain

C. decrease the affinity of haemoglobin with oxygen

D. release bicarbonate ions by the liver

Releted Question 3

A. Serum = Blood + Fibrinogen

B. Lymph = Plasma + RBC + WBC

C. Blood = Plasma + RBC + WBC

D. Plasma = Blood - Lymphocytes

Releted Question 4

A. Liver

B. Spleen

C. Red bone marrow

D. Kidney