Consider the following statements about the skin: 1. The epidermis is the outermost layer. 2. Melanin protects against UV radiation. 3. Sebaceous glands produce sweat. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the skin:
1. The epidermis is the outermost layer.
2. Melanin protects against UV radiation.
3. Sebaceous glands produce sweat.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only
Answer: Option C
Solution (By JKExamLibrary)
Epidermis is outer layer, melanin absorbs UV. Sebaceous glands produce sebum (oil), sweat is from sudoriferous glands. So 3 is incorrect.
Explanation:
The pulmonary veins are the only veins in the body that carry oxygenated blood. They transport oxygen-rich blood from the lungs back to the left atrium of the heart. In contrast, the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. All other veins carry deoxygenated blood and arteries carry oxygenated blood.
Explanation:
Ghrelin is a peptide hormone produced mainly by the endocrine cells of the stomach, especially when it is empty. It is often called the 'hunger hormone' because it acts on the arcuate nucleus of the hypothalamus to stimulate appetite (orexigenic effect) and promote food intake. Ghrelin levels rise before meals and fall after eating. It has the opposite effect of leptin, which suppresses appetite.
Explanation:
Earthworms (annelids) have a closed circulatory system with blood contained within vessels. Cockroach, snail, and butterfly have open circulatory systems where hemolymph bathes organs directly.
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