Question

1. Name two layered protective covering of
human heart.
2. What is the shape of RBC in human blood?
3. Why is the colour of the blood red?
4. Which kind of cells are found in the lymph?
5. Name the heart valve associated with the
major arteries leaving the ventricles.
6. Mention the artery which supplies blood to
the heart muscle.​

Answer 1

Answer:

1Pericardium layers

2The shape of the human red blood cell is known to be a biconcave disk. It is evident from a variety of theoretical work that known physical properties of the membrane, such as its bending energy and elasticity, can explain the red-blood-cell biconcave shape as well as other shapes that red blood cells assume.

3Human blood is red because hemoglobin, which is carried in the blood and functions to transport oxygen, is iron-rich and red in color. ... It's bright red when the arteries carry it in its oxygen-rich state throughout the body. And it's still red, but darker now, when it rushes home to the heart through the veins.

Answer 2

Answer:

1. Pericardium layers

Pericardium layersPericardium layers

Pericardium layersPericardium layersIt holds your heart in place in the chest cavity and protects from infections. Serous pericardium is the inner layer. It's further divided into two more layers: the visceral and parietal layers. The serous pericardium helps to lubricate your heart.

2. The shape of the human red blood cell is known to be a biconcave disk. It is evident from a variety of theoretical work that known physical properties of the membrane, such as its bending energy and elasticity, can explain the red-blood-cell biconcave shape as well as other shapes that red blood cells assume

3.