Question

Tissue respiration denotes-
A. Respiration by tissues
B. Gaseous exchanges between cell and tissue fluid
C. Cell respiration
D. Both B and C

Answer 1

The process of respiration is the combination of different physical and chemical steps by which oxygen reaches the different tissues of the body and waste metabolites such as carbon dioxide is removed. It occurs in almost every type of organism including the prokaryotic bacteria as well as other higher organisms.

Complete answer:
Respiration is an important chemical reaction that occurs in almost all living cells and is the way the nutrients are assimilated and broken down to absorbable condition and energy is produced. The process of respiration is a catabolic process in which breaks down the absorbed substances into small fragments. Through the process of respiration, energy is released and it is an exergonic process.
Basically, two types of respiration are observed, one is external respiration and the other is internal respiration. External respiration is a breathing process. It involves inhalation and exhalation of gases. In simple terms, the exchange of gases occurs in between the organisms and the environment. The main function in this type of respiration is bringing air into the lungs i.e. inhalation and releasing air to the atmosphere i.e. exhalation. The process begins at the nose or mouth, where oxygenated air is brought in. The air passes through the pharynx, larynx, trachea, and bronchi. And it finally reaches the alveoli where the gaseous exchange takes place. Through the external respiration body obtains oxygen.
Internal respiration involves the transportation of gases between the blood and body tissues as oxygen is transported to the tissues and waste products. Within the lungs oxygen diffuses across the thin epithelium of lung alveoli. While oxygen is released into the cells, carbon dioxide is being picked up and transported from tissue cells to the lungs. The oxygen obtained is used by cells in cellular respiration.
Internal respiration is also known as tissue respiration. It is the exchange of respiratory gases within the cells occurring through the process of the biological oxidation of nutrients. This process takes place in the cellular environment of the eukaryotic cells. It involves the processes of glycolysis and Kreb's cycle. In glycolysis, glucose is broken down into pyruvates and it occurs in the cytoplasm of the cell. The pyruvate obtained from the breakdown of glucose in the process of glycolysis enters the Krebs cycle which takes place in the mitochondrial matrix. The end product of Krebs cycle is water and carbon dioxide and energy are released in the form of ATP.
Thus, in tissue respiration the gaseous exchanges between cell and tissue fluid as well as cell respiration occurs.

Therefore, the correct and appropriate option is option D.

Note: Tissue respiration or internal respiration denotes the exchange of gases between cells and tissue fluid i.e oxygen diffuses at alveoli to blood and receives carbon dioxide from the blood to alveoli. This process occurs in the cells of eukaryotes. It involves the process of glycolysis and Kreb's cycle to produce energy and water and carbon dioxide is also produced as an end product.