Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
Choose an option to check your answer.
Interneurons lie within the CNS or ganglia and connect sensory and motor pathways. They are essential for processing, reflexes, and decision-making.
Choose an option to check your answer.
Peptide hormones are water-soluble and usually bind surface receptors, triggering intracellular signaling. Steroid hormones often cross membranes and bind intracellular receptors.
Choose an option to check your answer.
Thermoreceptors detect temperature changes, while nociceptors detect damaging stimuli. Together they help prevent tissue injury from heat.
Choose an option to check your answer.
Motor neurons transmit signals from the nervous system to effectors such as muscles. Damage reduces voluntary or reflex movement.
Choose an option to check your answer.
Internal chemoreceptors can detect gases or pH changes and help regulate breathing and circulation. This supports homeostasis.
Choose an option to check your answer.
Steroid hormones are lipid-soluble and can pass through cell membranes. Their receptor complexes often regulate transcription in the nucleus.
Choose an option to check your answer.
Photoreceptors in the retina detect light and initiate neural pathways that control pupil size. This protects the retina and improves visual focus.
Choose an option to check your answer.
Effectors are organs or cells that carry out responses, including muscles and glands. They respond to neural or hormonal commands.
Choose an option to check your answer.
Rods are retinal photoreceptors specialized for low-light vision. Cones support color and high-acuity vision in many vertebrates.
Choose an option to check your answer.
The thyroid produces thyroxine, which influences metabolic rate, growth, and development. Low thyroxine commonly slows metabolism.
Choose an option to check your answer.
Sensory receptors convert one form of stimulus energy, such as light, pressure, or chemicals, into electrical signals the nervous system can interpret.
Choose an option to check your answer.
Nerve signals are fast and precise, making them suitable for immediate responses such as withdrawal, escape, and coordinated movement.
