All MCQs

Cytotoxic T cells recognize infected cells and kill them, limiting viral replication. This is a key cell-mediated immune response.

Invertebrates generally lack vertebrate-style adaptive immunity but possess effective innate defenses, including barriers, phagocytic cells, antimicrobial peptides, and clotting-like responses.

Exercise increases tissue oxygen and nutrient demand. Higher heart rate and cardiac output increase delivery and waste removal.

The left ventricle pumps oxygenated blood into the aorta and systemic arteries, supplying the body.

Insects rely on innate immune mechanisms such as phagocytic hemocytes, melanization, clotting, and antimicrobial peptides.

Hemocytes in many invertebrates participate in phagocytosis, encapsulation, clotting, and antimicrobial defense within hemolymph.

Plasma is the liquid component of blood that transports dissolved nutrients, hormones, wastes, ions, and proteins.

Blood circulation transports heat within the body. Ectotherms use behavior and circulation to manage body temperature.

Melanization is an invertebrate immune reaction that encapsulates or kills invaders. It is common in arthropod defense.

Large animals have cells far from the external environment. Circulatory systems transport gases, nutrients, wastes, hormones, and immune components efficiently.

Leukocytes or white blood cells participate in immune defense, including phagocytosis, antibody production, and cell-mediated responses.

Cardiac output is the volume of blood pumped per minute and equals heart rate times stroke volume. It is a core determinant of blood flow.