Practice Pakistan questions with answers and explanations.
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The left ventricle pumps oxygenated blood into the aorta and systemic arteries, supplying the body.
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Insects rely on innate immune mechanisms such as phagocytic hemocytes, melanization, clotting, and antimicrobial peptides.
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Hemocytes in many invertebrates participate in phagocytosis, encapsulation, clotting, and antimicrobial defense within hemolymph.
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Plasma is the liquid component of blood that transports dissolved nutrients, hormones, wastes, ions, and proteins.
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Blood circulation transports heat within the body. Ectotherms use behavior and circulation to manage body temperature.
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Melanization is an invertebrate immune reaction that encapsulates or kills invaders. It is common in arthropod defense.
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Thyroid-stimulating hormone from the anterior pituitary stimulates thyroid hormone production. It is part of the hypothalamic-pituitary-thyroid axis.
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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.
