physiology Mcqs
101. Gastrin is produced by _____________?
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A. Gastric antral cells

B. All

C. Pituitary

D. Pancreas

102. A decrease in the arterial PO2 is seen in______________?
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A. Paralysis of inspiratory muscles

B. Decrease in hemoglobin concentration of arterial blood

C. Sluggish blood flow

D. High altitudes
103. Which of the following hormones is released from the posterior pituitary ?
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A. Antidiuretic hormone

B. ACTH

C. Luetinizing hormone

D. Growth hormone

105. In jaundice, there is an unconjugated hyperbilirubinemia which is most likely due to __________?
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A. Cirrhosis

B. Hepatitis

C. Increased break down of red cells

D. Obstruction of bile canaliculi

106. Which amongst the following is the gold standard for demonstrating hcG____________?
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A. Immunofluorescence

B. Radio immune assay

C. Latex agglutination

D. ELISA

107. Energy expenditure during normal breathing____________?
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A. 50% -75% of total energy spent

B. 2% 3% of total energy spent

C. 25% 50% of total energy spent

D. 15% 20% of total energy spent

110. Which of the following results due to excessive parathormone secretion_______________?
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A. Increased serum calcium

B. Increased excretion of phosphates

C. Increase excretion of calcium

D. Decrease excretion of calcium

111. Peristalsis involves coordinated contraction and relaxation______________?
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A. None of the above

B. Dorsal and ventral to food bolus

C. Lateral and medial to food bolus

D. Above and below the food bolus
112. Pancreas produce_____________?
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A. All of the above

B. Pepsinogen

C. Chymotrypsinogen

D. Hydrochloric acid

113. Aldosterone______________?
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A. Increases reabsorption of sodium

B. Increases exceretion of potassium

C. Increases retention of sodium

D. Both A and B

114. Oxygen dissociation cure is shifted to the right in all except_____________?
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A. Increase of 2, 3 3 DPG

B. Fall in pH

C. HbF

D. Rise in temperature

115. Cyanosis or bluish coloration of skin and mucus membrane depends upon______________?
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A. The relative proportion of reduced and oxygenated hemoglobin

B. Thickness of the skin

C. The absolute amount of reduced hemoglobin

D. Fragility of capillaries

116. Histamine stimulate the secretion of_______________?
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A. HCL by stomach

B. Pancreatic enzymes

C. Amylase by salivary gland

D. Gastrin by stomach

117. Aldosterone secretion is increased when there is a fall in____________?
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A. Plasma K+

B. Plasma Na+

C. pH of the plasma

D. Angiotensin II level

118. The best stimulator of respiratory center is____________?
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A. Increase in arterial carbon dioxide level

B. Decrease in arterial carbon dioxide level

C. Increase in arterial oxygen level

D. None of the above

119. The final sugars in intestinal chyme are____________?
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A. Ribose & xylulos

B. Glucose & fructose

C. Ribose & mannose

D. Xylulose & fructose

120. Insulin increases the activity of___________?
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A. HMG. CoA reductase

B. HMG- CoA synthase

C. HMG- CoA lyase

D. Thiolase

121. Carotid body function in an organ work as_______________?
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A. Differential pressure of oxygen in in tissue fluids

B. Differential pressure of oxygen in in hemoglobin synthesis

C. Differential pressure of oxygen in arterial blood

D. Differential pressure of oxygen in venous blood

122. Limitation of inspiration by vagal lung inflation signals is called the______________?
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A. Bainbridge reflex

B. Dynamic stretch reflex

C. Autonomic reflex

D. Herring Breur reflex
123. All are seen in Cushing s syndrome except_______________?
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A. Truncal obesity

B. Hypoglycemia

C. Hypertension

D. Poor wound healing

124. Bile salt repeats its cycle in____________?
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A. 4 times a day

B. 8 times a day

C. 10 times a day in fasting

D. 2 times in between meals

125. Progesterone production in the ovary is primarily by______________?
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A. Mature follicles

B. Corpora lutea

C. Corpora albicans

D. Stroma

126. All are actions of CCK except_______________?
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A. Causes GB contraction

B. Increased pancreatic secretion

C. Relax lower esophageal sphincter

D. Increased gastric secretion
127. Hormones FSH & LH of anterior pituitary gland acts on___________________?
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A. Testis but not ovaries

B. Ovaries but not testis

C. Both Testis and ovaries

D. Adrenal cortex

128. Adrenal gland has two parts; cortex and medulla. Which of the following is correct______________?
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A. Cortex is under the control of ACTH

B. Both cortex and medulla are under the control of autonomic nervous system

C. Cortex is exocrine and medulla is endocrine

D. All of the above

129. Alveolar O2 tension is______________?
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A. Not affected by respiratory depression

B. Increased by hyperventilation

C. Decreased by hyperventilation

D. Similar to venous O2 tension

130. The supraoptic nucleus of the hypothalamus is believed to control secretion of which of the following hormones ?
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A. Growth hormone

B. Oxytocin

C. Adreno corticotrophic hormone

D. Antidiuretic hormone
131. Reverse T3 is__________________?
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A. Isomerisation product of T3 and active

B. Reverse of T3

C. Synthetic derivative

D. Isomerisation product of T3 and inactive
132. Which of the following hormones act via cAMP ?
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A. Adrenalin

B. Vasopressin

C. Parathormone

D. Insulin

133. What effect does hyperventilation have on the oxygen binding affinity of hemoglobin ?
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A. P50 increase and the oxygen affinity decreases

B. P 50 decreases and the oxygen affinity increases

C. P50 and oxygen affinity decrease

D. P 50 and oxygen affinity increase
134. Hypoxia is characterized by ___________?
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A. All of the above

B. Favorable response to 100% oxygen

C. Low arterial PO2

D. Intense chemoreceptor response

135. Hormone released during increased stress is_____________?
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A. Somatostatin

B. Thyroxine

C. Growth hormone

D. Cortisol
136. A phaeochromocytoma is a tumour of the____________?
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A. None of the above

B. Parathyroids

C. Adrenal cortex

D. Pituitary

137. Pepsinogen is activated by ___________________ ?
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A. Enterokinase

B. Chymotrypsin

C. Trypsin

D. Low pH
138. Menopausal hormonal relations are______________?
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A. Lh/FSH increase

B. Gonadotropins increase , estrogens decrease

C. Estrogens and gonadotropins decrease

D. Both increase

139. A diet deficient in calcium will result in_____________?
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A. Production of parathyroid hormone and bone resorption

B. Increased ability to cross link fibrin

C. Production of Calcitonin and a low blood calcium level

D. Stimulation of the thyroid gland

140. Glucocorticoids have all the following actions except_______________?
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A. Anti insulin action in peripheral tissues

B. Increase in protein catabolism

C. Decrease in glucose uptake by the heart

D. Increase in blood glucose level

141. Oxygen affinity is increased by all except_________________?
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A. Increased HbF

B. Hypothermia

C. Hypoxia

D. Alkalosis

142. Thyroxine causes all the following except______________?
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A. Increased basal metabolism

B. Increased oxygen consumption

C. Decreased cell metabolism

D. Increased pulmonary ventilation

144. Oxygen affinity decreases in_________________?
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A. HbF

B. Hypoxia

C. Increased pH

D. Hypothermia

145. Glucocorticoids decrease inflammatory reaction by reducing_______________?
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A. Fibroblastic activity

B. Activity of histamine

C. Release of histamine

D. Neutrophils

146. Bile acids are derived from_____________?
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A. Cholesterol

B. Bile salts

C. A & B

D. Bile pigments

147. The most important function of hydrochloric acid in the stomach is_______________?
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A. Neutralization of chyme

B. Stimulation of pancreatic secretion

C. Activation of pepsinogen

D. Destruction of bacteria

148. The effect which is seen due to decrease in serum calcium concentration is_______________?
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A. Depression of Nervous system

B. Increase the renal absorption

C. Relaxation of muscle

D. Excitability of the muscle
149. Most potent stimulus for secretin is______________?
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A. Fat

B. Dilattion of intestine

C. Protein

D. Acid chyme