The protein in red blood cells that transports oxygen is:
A. Fibrinogen
B. Collagen
C. Hemoglobin
D. Insulin
Answer: Option C
Solution (By JKSSB Mock Tests)
Hemoglobin is an iron-containing metalloprotein in erythrocytes that binds oxygen reversibly, forming oxyhemoglobin. Each molecule has four heme groups, each binding one O₂. Collagen is a structural protein, insulin a hormone, fibrinogen a clotting protein. Hemoglobin also carries some CO₂ and buffers blood pH.
Explanation:
Gout is a form of arthritis resulting from hyperuricemia and deposition of monosodium urate crystals in joints, causing intense pain and inflammation. It is often diet-related. Rheumatoid arthritis is autoimmune, osteoarthritis is degenerative, osteoporosis is loss of bone mass.
Explanation:
GHRH, from the hypothalamus, stimulates the anterior pituitary to secrete growth hormone. Somatostatin inhibits GH release. Dopamine inhibits prolactin.
Consider statements about the human heart: 1. The left ventricle has the thickest wall. 2. The tricuspid valve is between the left atrium and ventricle. 3. The SA node is the natural pacemaker. Which are correct?
Explanation:
The left ventricle has the thickest muscular wall to pump blood at high pressure into the systemic circulation. The sinoatrial (SA) node generates impulses spontaneously, acting as the natural pacemaker. The tricuspid valve is located between the right atrium and right ventricle; the bicuspid (mitral) valve is on the left side. Thus, statements 1 and 3 are correct.
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