Consider the following statements about the human kidneys: 1. They are located in the abdominal cavity. 2. They produce the hormone renin. 3. They filter approximately 180 liters of blood per day. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the human kidneys:
1. They are located in the abdominal cavity.
2. They produce the hormone renin.
3. They filter approximately 180 liters of blood per day.
Which of the above is/are correct?
A. 2 and 3 only
B. 1, 2, and 3
C. 1 and 2 only
D. 1 and 3 only
Answer: Option A
Solution (By JKSSB Mock Tests)
Kidneys are retroperitoneal, not in the abdominal cavity proper. They produce renin, and filter ~180 L/day (GFR ~125 mL/min). So 1 is incorrect.
Explanation:
Differential centrifugation separates organelles by size and density by spinning homogenized cells at progressively higher speeds. Each pellet is enriched in a particular organelle. Density gradient centrifugation further refines separation. Electrophoresis separates by charge/size, chromatography by differential partitioning, spectrophotometry measures absorbance.
Consider the following statements about the human heart:
1. The pericardium is a protective sac around the heart.
2. The endocardium lines the heart chambers.
3. The myocardium is the outermost layer.
Which of the above is/are correct?
Explanation:
Pericardium is outer sac, endocardium inner lining. Myocardium is the middle muscular layer; the outermost is epicardium (visceral pericardium). So 3 is incorrect.
Explanation:
Pertussis (whooping cough) is a respiratory infection characterized by severe coughing fits. Diphtheria is Corynebacterium, tetanus Clostridium, scarlet fever Streptococcus.
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