NEET MDS Shorts
53248
PhysiologyThe primary active transport mechanism for calcium absorption in the intestine involves all of the above: vitamin D dependent calcium binding protein (calbindin), sodium-calcium exchanger (NCX), and calcium-dependent ATPase.
15025
PhysiologyThe primary function of the juxtaglomerular apparatus (JGA) is the secretion of renin, which regulates blood volume and blood pressure.
71387
Physiology
The sodium-potassium-2-chloride (Na+-K+-2Cl-) cotransporter in the thick ascending limb of the loop of Henle is responsible for reabsorbing sodium and chloride ions from the tubular fluid into the blood. This process helps in the maintenance of osmotic balance and the generation of the medullary interstitial gradient.
46226
Physiology
The increased pulse rate and blood pressure during REM sleep are associated with the heightened brain activity and autonomic system arousal that occurs during this phase of sleep, despite the presence of muscular atonia.
39624
Physiology
Answer: 1) Depolarization
Explanation: EPSPs occur when the neurotransmitter binds to postsynaptic receptors that open sodium channels, allowing sodium ions to flow into the neuron and causing the membrane to depolarize. This increases the excitability of the neuron, bringing the membrane potential closer to the threshold for action potential firing.
19090
Physiology
The primary mechanism of H+ secretion by parietal cells is through the action of the H+-K+ ATPase pump, also known as the proton pump. This enzyme is responsible for actively transporting H+ ions into the gastric lumen while moving K+ ions into the cells, thereby acidifying the gastric content.
51469
Physiology
In the sympathetic nervous system, the pre-to-post ganglionic fiber ratio of 1:20 to 1:100 indicates that there are fewer postganglionic fibers than preganglionic fibers. This ratio suggests that each preganglionic neuron synapses with multiple postganglionic neurons, thereby amplifying the sympathetic response to a given input.
99873
PhysiologyAngiotensin I is formed by the action of renin on Angiotensinogen, which is produced by the liver and released into the bloodstream.
42501
Physiology
The physiological capacity of the bladder is the maximum intravesical volume tolerated without undue discomfort. It is usually between 250 and 450 ml. The bladder can stretch to hold more urine, but this is considered beyond the normal physiological capacity and can cause discomfort.
34348
PhysiologyThe first heart sound relates to Opening of the A-V valves