Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Low insulin reduces glucose uptake and storage, causing blood glucose to rise. Long-term imbalance affects metabolism and tissues.
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Steroid and thyroid hormone receptors often function inside cells and regulate gene expression. Many peptide hormone receptors are on the membrane.
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Most reptiles have two atria and a partially divided ventricle. Crocodilians are exceptions with four-chambered hearts.
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Oxytocin stimulates uterine contractions and milk ejection in mammals. It is released from the posterior pituitary.
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Rising osmolarity stimulates ADH release, leading to increased kidney water reabsorption and more concentrated urine.
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Photoperiod can influence melatonin and reproductive hormone pathways. Many animals use seasonal cues to time reproduction.
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Arteries receive blood directly from heart contractions and have elastic muscular walls that withstand high pressure.
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Prolactin stimulates milk production in mammary glands. Oxytocin causes milk ejection, so the two hormones have related but different functions.
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Gonads produce sex steroids that regulate reproductive organs, secondary sexual traits, cycles, and behavior.
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Hormones such as glucocorticoids can alter immune responses. This shows endocrine regulation interacts with defense and homeostasis.
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Venous pressure is relatively low, especially in limbs. Valves help maintain one-way flow back to the heart.
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Melatonin from the pineal gland is associated with circadian rhythms and responses to darkness. It helps coordinate daily physiological cycles.
