NEET BIOLOGY

Detailed explanation-1: -Sensory Receptors. Sensory receptors are nerve endings or specialised cells which convert (transduce) stimuli from the environment into afferent nerve impulses; the impulses pass into the CNS where they initiate appropriate voluntary or involuntary responses.

Detailed explanation-2: -Receptors are specialised cells that detect a stimulus. Their job is to convert the stimulus into electrical signals in nerve cells.

Detailed explanation-3: -Cell-Surface Receptors These receptors are also known as transmembrane receptors. These are proteins that are found on the surface of cells and span the plasma membrane. They bind to ligands that cannot themselves pass through the plasma membrane.

Detailed explanation-4: -A stimulus is a change in the environment (either external or internal) that is detected by a receptor. Receptors transform environmental stimuli into electrical nerve impulses. These impulses are then transmitted via neurons to the central nervous system where decision-making occurs.

Detailed explanation-5: -Sensory receptors. Sensory receptors have specialized functions, and respond to environmental changes in stimuli. Usually, activation of these receptors by stimuli causes graded potentials triggering nerve impulses along the afferent PNS fibers reaching the CNS.