What is the function of hemoglobin?
Hamoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the body’s tissues and carrying carbon dioxide from the tissues to the lungs for elimination. It is one of the most important proteins in the human body and plays a vital role in maintaining homeostasis. The structure of hemoglobin is composed of four protein chains, two alpha chains, and two beta chains, each of which contains a heme group. Each heme group consists of an iron atom that can bind to one molecule of oxygen. When oxygen binds to hemoglobin, the molecule undergoes a conformational change that makes it easier for…
What is enzyme and characteristics?
Enzymes are biological catalysts that facilitate chemical reactions in living organisms. They are typically proteins, although some RNA molecules also have catalytic activity. Enzymes are essential for life because they speed up the reactions that are necessary for cells to function properly. Without enzymes, many biochemical reactions in the body would occur too slowly to support life. Enzymes work by lowering the activation energy required for a chemical reaction to occur. Activation energy is the amount of energy needed to start a reaction, and enzymes reduce this energy barrier, allowing the reaction to occur more quickly. Enzymes do this by binding to specific molecules, called substrates, and positioning them in…
MCQ on Breathing and Exchange of Gases-2
Visiting high mountains may cause altitude sickness in men living in plain areas. Prime cause of this is (a) excess of CO2 in blood (b) decreased efficiency of haemoglobin (c) decreased partial pressure of oxygen (d) decreased proportion of oxygen in air. Increase in body temperature makes oxygen haemoglobin dissociation curve (a) shift to left (b) shift to right (c) hyperbolic (d) parabolic. Bohr’s effect is related with (a) reduced carbon level in lymph (b) reduced oxygen level in haemoglobin (c) oxidised phosphorus level in blood (d) reduced carbon dioxide level in blood. After deep inspiration, capacity of maximum expiration of lung is called (a) total lung capacity (b) functional…
