Which are the special proteins in muscles that contract and relax to cause movement?

 

Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.

Vitamin D also known as Sunshine vitamin is produced in the body when our skin is exposed to sunlight. Its deficiency leads to a disease in which bone tissue doesn't properly mineralize leading to soft bones. The vitamin D deficiency disease in adults is known as Hypovitaminosis D.

Biological membranes are composed of phospholipids, Proteins and Carbohydrate groups attached to lipids and proteins.

Increasing the Alveolar ventilation rate will increase the rate of carbon dioxide diffusion from the blood to the alveoli.

Mitochondria which is present in both plant and animal cells supplies energy to the cells and hence called as the powerhouse of the cell.

Corneas are only tissues that don’t have blood vessels. Tissues are the level cellular organization in the human body which lies between cells and a complete organ. Tissues of similar cells group together to form an organ.

There are four types of tissues. They are :

Epithelial,

Connective,

Muscular, and

Nervous tissue.

Vitamins are indispensable for the maintenance of optimal health is the only statement that is true about vitamins.

Ribosomes comprise a complex macro molecular machine, found within all living cells, that serves as the site of biological protein synthesis. Ribosomes link amino acids together in the order specified by messenger RNA molecules.