Test: Sense Organs - JAMB MCQ

The skin is the largest organ of the body and contains various sensory receptors that detect touch, pressure, and temperature. These receptors send signals to the brain, allowing us to perceive sensations such as texture, pain, and temperature.

The lens of the eye plays a crucial role in focusing light onto the retina. It is a transparent structure located behind the iris and can change shape to adjust the focal length, allowing us to see objects clearly at different distances.

The nose is the sense organ responsible for detecting odors. Inside the nasal cavity, there are specialized olfactory receptors that can detect and distinguish various smells. When we inhale, odor molecules bind to these receptors, triggering nerve impulses that are transmitted to the brain for interpretation.

The eardrum, also known as the tympanic membrane, is a thin, sensitive membrane located at the end of the ear canal. When sound waves enter the ear, they cause the eardrum to vibrate. These vibrations are then transmitted to the small bones of the middle ear, ultimately reaching the cochlea, where sound is processed.

The tongue is the primary sense organ responsible for detecting taste. It contains taste buds, which are clusters of specialized cells that can detect different flavors such as sweet, sour, bitter, salty, and umami. When food or liquid comes into contact with the taste buds, signals are sent to the brain, allowing us to perceive taste.

The iris is the colored part of the eye surrounding the pupil. It controls the size of the pupil, which is the central opening of the iris. By adjusting the size of the pupil, the iris regulates the amount of light entering the eye, thus helping to protect the sensitive structures of the eye and control the intensity of the incoming light.

The skin contains thermoreceptors that detect changes in body temperature. These receptors send signals to the brain, allowing us to sense and respond to temperature variations in our environment. When the skin detects a change in temperature, it can trigger physiological responses such as sweating or shivering to help regulate body temperature.

The semicircular canals are part of the inner ear and are responsible for maintaining balance and equilibrium. These fluid-filled canals are oriented in different planes and are sensitive to rotational movements of the head. When we move our head, the fluid inside the semicircular canals also moves, sending signals to the brain to help us maintain balance.

The ear is the sense organ primarily responsible for detecting sound. Sound waves travel through the ear and are detected by the structures of the ear, including the outer, middle, and inner ear. The inner ear, specifically the cochlea, converts sound vibrations into electrical signals that are then transmitted to the brain for interpretation.

The retina is the innermost layer at the back of the eye. It contains specialized cells called photoreceptors, namely rods and cones. These cells convert light energy into electrical signals that can be processed and transmitted to the brain via the optic nerve. The retina plays a crucial role in vision by capturing and processing visual information.