Govt. Exams
During exercise, lactate production increases blood acidity. Hyperventilation increases CO2 elimination, shifting the CO2-bicarbonate equilibrium to maintain blood pH (7.35-7.45).
Intrinsic factor, produced by gastric parietal cells, is essential for vitamin B12 absorption in the terminal ileum. Its deficiency prevents B12 absorption, causing pernicious anemia.
The proximal convoluted tubule epithelial cells have numerous mitochondria and microvilli for active transport of glucose, amino acids, and ions.
Intrinsic factor is required for B12 absorption; its deficiency leads to pernicious anemia due to impaired vitamin B12 absorption.
The fight-or-flight response involves sympathetic activation releasing epinephrine and norepinephrine causing vasoconstriction and tachycardia.
The resting potential is maintained at -70 mV primarily by the Na+/K+ ATPase pump and differential ion permeability.
Plasma cells (differentiated B lymphocytes) produce and secrete specific antibodies in response to antigens.
The jejunum is the primary site for nutrient absorption due to its extensive villi and optimal length for absorption process.
Blood pH (7.35-7.45) is maintained by multiple buffer systems including bicarbonate, phosphate, and protein buffers working together.
ADH (Antidiuretic hormone) is produced by the hypothalamus and stored/released by the posterior pituitary, not the anterior pituitary.
