Tag: blood circulatory system of human

Tachycardia refers to an abnormally fast resting heart rate - usually at least 100 beats per minute. The threshold of a normal heart rate (pulse) is generally based on the person's age. 

Among men, the 5 most common sites of cancer diagnosed are lung (pulmonary), prostate, colorectum, stomach and liver cancer.
Therefore, the correct answer is option D.

• Cholesterol and other fats travel in the bloodstream in the form of lipoproteins.
  
• Saturated fats in the diet raise the level of LDL (low-density lipoprotein) cholesterol in the blood.
• This LDL cholesterol is called bad cholesterol.
• It forms a plaque-like substance on the walls of arteries which causes the narrowing of arteries.
• Thus, it blocks the natural flow of blood and causes a severe risk for heart attack and stroke. So, the correct answer is 'Narrowing arteries by fat deposition'.

Carbon monoxide is a harmful gas that combines with haemoglobin to form a stable compound. It displaces the oxygen that is normally carried by the haemoglobin and reduces the oxygen-carrying ability of the blood by reducing the concentration of free hemoglobin in the blood. 

When carbon monoxide (CO) is inhaled, it combines with the haemoglobin to form a stable compound called as carboxyhemoglobin (COHb). CO displaces oxygen attached to the carrier molecule, haemoglobin. The COHb bond is over 200 times stronger than oxygen's bond with haemoglobin. The strong COHb bond makes it difficult for the body to eliminate CO from the blood. At 30-50% COHb symptoms are nausea, severe headaches, dizziness and increased pulse and respiration. COHb levels over 50% cause progressive symptoms proceeding to loss of consciousness, collapse, convulsions, coma and finally death.

Carbon monoxide is a light and toxic gas which impairs the process of respiration. The affinity of the carbon monoxide towards haemoglobin is more compared to the affinity towards oxygen which results in the binding of carbon monoxide with haemoglobin, forming carboxyhemoglobin. There are very less sites for oxygen binding and transport of the oxygen is reduced in the body which is known as carbon monoxide poisoning. Due to lack of oxygen, the process of respiration is hampered.

Carbon monoxide is a harmful gas that combines with haemoglobin to form a stable compound. It displaces the oxygen that is normally carried by the haemoglobin and reduces the oxygen-carrying ability of the blood. The affinity between hemoglobin and carbon monoxide is approximately 200 times greater than the affinity between hemoglobin and oxygen, so hemoglobin binds to carbon monoxide in preference to oxygen.

In coronary thrombosis, blood clotting occurs which becomes fatal. Physicians normally prescribe such medicines which prevent blood clotting or dissolve the clots that are formed.

The hemoglobin have more affinity towards the carbon monoxide rather than the oxygen. When the air is inhaled and there is presence of carbon monoxide, the hemoglobin protein binds to the carbon monoxide. This results in the formation of complex called as carboxyhemoglobin. This is the condition in which there is reduction in the supply of oxygen to the tissues which might lead to death.

The first human heart transplant was performed on 3rd December, 1967 by a team of 30 doctors headed by Prof. Christian Barnard on 55 years old Louis Washkansky at the Groote Schurr Hospital, Cape Town, South Africa. Inspite of the operation by a leading' surgeon WasEKansKy died on @Ist December, 1967.