Transportation in Plants and Animals Test - 2

In adult humans, red blood cells are produced in the bone marrow in the heads of long bones in a process known as hematopoiesis.

Red blood cells of camel possesses nucleus. Camels have to live without food and water for a long time. So, their red blood cells have to divide and form new cells. Only nucleated cells can divide.

Heart of man is myogenic. Myogenic contraction refers to a contraction initiated by the myocyte cell itself instead of an outside occurrence or stimulus such as nerve innervation.

Heart of a fish is special because it has venous blood only as they have a closed-loop circulatory system.

If the vagus branch of frog is stimulated, the heart beat willI be decreased due to its parasympathetic action.

The opening of truncus arteriosus in frog is guarded by three semilunar valves.

Bicuspid valves are present in between left atrium and left ventricle.It has two cusps, or leaflets,the anteromedial leaflet and the posterolateral leaflet that guard the opening.

Tricuspid valves are present in between right atrium and right ventricle. The function of the valve is to prevent back flow of blood into the right atrium.

Heart beat is heard on left side as aorta is on left side.

Left ventricle has the thickest walls, as it has to pump the blood to whole body.