NEET UG · Biology

Excretory Products, Locomotion and Movement, Neural Control

27 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 27 questions

  1. Which group of organisms exhibits uricotelism, excreting nitrogenous waste primarily as relatively insoluble, non-toxic uric acid pellets to conserve water?
  2. In the human nephron, which histological adaptation of the proximal convoluted tubule (PCT) facilitates the reabsorption of 70 to 80 percent of filtered electrolytes and water?
  3. In the countercurrent multiplier mechanism of the loop of Henle, what are the distinct permeability characteristics of the descending limb versus the ascending limb?
  4. What triggers the release of the enzyme renin by juxtaglomerular (JG) cells in the kidney?
  5. How does Antidiuretic Hormone (ADH / Vasopressin), released from the posterior pituitary, promote the formation of concentrated urine?
  6. Which cardiac hormone acts as a physiological antagonist to the Renin-Angiotensin-Aldosterone System (RAAS) by promoting natriuresis and vasodilation?
  7. In the sliding filament mechanism of skeletal muscle contraction, what structural changes occur within a sarcomere during contraction?
  8. Which subunit of the troponin regulatory protein complex directly binds calcium ions to initiate cross-bridge formation between actin and myosin?
  9. Why are red muscle fibers capable of sustained, fatigue-resistant aerobic contractions compared to white muscle fibers?
  10. How many total bones constitute the adult human axial skeleton, and which anatomical structures are included?
  11. Which type of synovial joint allows rotational movement around a single central axis, as seen between the first two cervical vertebrae (atlas and axis)?
  12. Which autoimmune neurological disorder is characterized by autoantibodies targeting nicotinic acetylcholine receptors at the neuromuscular junction, leading to progressive muscle weakness and paralysi…
  13. Why is the resting membrane potential of an unexcited human neuron negative on the inside (-70 mV) relative to the extracellular fluid?
  14. During the generation of a nerve impulse (action potential), which event is responsible for the rapid depolarization phase of the axonal membrane?
  15. At a chemical synapse, what ionic trigger directly causes synaptic vesicles to fuse with the presynaptic terminal membrane and exocytose neurotransmitters into the synaptic cleft?
  16. Which large tract of myelinated nerve fibers connects the left and right cerebral hemispheres in the human brain, allowing interhemispheric communication?
  17. Which subcortical brain structure acts as the central regulator for core body temperature, appetite, thirst, and neuroendocrine hormone synthesis?
  18. Which brain structure is anatomically composed of the midbrain, pons varolii, and medulla oblongata?
  19. In a classical monosynaptic knee-jerk (patellar tendon) reflex arc, what is the correct anatomical pathway traversed by the nerve impulse?
  20. Which division of the autonomic nervous system is responsible for the 'fight-or-flight' stress response, causing pupillary dilation, tachycardia, bronchodilation, and inhibition of peristalsis?
  21. Which mineral deficiency or endocrine disruption causes 'tetany', characterized by sustained, painful spasms of skeletal muscles?
  22. Which post-menopausal metabolic bone disease is characterized by a significant decrease in bone mineral density and increased susceptibility to fractures due to declining estrogen levels?
  23. During clinical hemodialysis in a patient suffering from acute renal uremia, how is the dialyzing fluid formulated relative to the patient's blood plasma?
  24. What specific diagnostic urinalysis findings are classic pathological hallmarks of uncontrolled Diabetes Mellitus?
  25. What is the biological role of the sarcoplasmic reticulum (SR) in the regulation of skeletal muscle contraction and relaxation?
  26. Which anatomical structure of the inner ear contains the organ of Corti, the sensory receptor organ for hearing?
  27. In the human eye, what is the anatomical name for the central depression in the macula lutea that provides the highest visual acuity and resolution?

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