Tag: blood circulatory system of human

The cardiac cycle is regulated by specialized areas in the heart wall, that forms the conduction system of the heart. Two of these areas are tissue mass, called as nodes; the third is a group of fibers called as the atrioventricular bundle. 

Answer is option C i.e. "Lack of iron"
Cardiovascular diseases (CVD) are a group of disorders of the heart and blood vessels (e.g. coronary heart disease, cerebrovascular disease,congenital heart disease, etc.). The most important risk factors of CVD are hypertension (raised blood pressure), diabetes (raised blood glucose), hyperlipidaemia (raised blood lipids), unhealthy diet, obesity (overweight), tobacco use, smoking and harmful use of alcohol.
Also, lack of iron leads to anemia or lack of hemoglobin production and not CVD.

Chylomicron remnants, VLDL, IDL, LDL, and Lp (a) are all pro-atherogenic, while HDL is anti-atherogenic.

Congenital heart disease refers to the problem in the structure of the heart that is present at birth. It can be related to the wall of the heart, the valves of the heart and the arteries and veins associated with the heart. Patent Foramen Ovale is the example of congenital heart disease in which the septal wall between the right and the left atrium is not formed.

• Hair loss can be the result of heredity, hormonal changes, medical conditions or medications. Anyone can experience hair loss, but it's more common in men.
•  Hereditary hair loss with age is the most common cause of baldness. 
• Hair follicles thrive on nutrients and oxygen supplied by the blood capillaries. Increased blood circulation to the scalp encourages the scalp to increase hair growth throughout the entire head.
•  A lack of oxygen affects all cells, including the hair cells and can cause premature hair thinning and hair loss. 
• Hence,  hair loss is more in old age is due to Reduction of blood supply.
• So, the correct answer is 'Reduction of blood supply'.

. If an Rh-positive man marries an Rh-negative woman, then the first foetus (and foetuses thereafter) will be Rh-positive. In this case, the Rh-positive antigen from the foetus will enter into the bloodstream of the mother and there will be the formation of anti-Rh antibodies in mother’s body. During her second pregnancy, these antibodies will attach the red blood cells of the Rh-positive foetus and coagulate the blood, resulting in severe complications. These complications arising due to Rh incompatibility are called erythroblastosis foetalis.

Atherosclerosis is a disease condition of the arteries, where the lumen of the arteries gets narrow because of deposition of lipids in the endothelial and mesothelial layers of the blood vessel. Prolonged deposition of lipids leads to hardening of the walls of these arteries and blood flow through the arteries is reduced. Thus, the correct answer is option B.

The cardiac sphincter separates the esophagus from the stomach. When cardiac sphincter fails to close and leads to regurgitation of food and gastric acid into the esophagus from stomach it leads to heat burn. The symptoms of heat burn include a chronic cough, burning feeling in the chest, chest pain and burning at the back of the throat.

The events of a heart attack can be put in a sequence of I, IV, II, III.