Nervous System — Set 3
Biology · तंत्रिका तंत्र · Questions 21–30 of 50
The 'master gland' of the endocrine system is controlled by which brain part?
Correct Answer: A. Hypothalamus
The hypothalamus controls the pituitary gland, which is known as the master gland. It secretes releasing hormones to regulate various bodily functions through the bloodstream. This creates a vital link between the brain and the hormone system.
Nerve impulses travel along the axon in the form of?
Correct Answer: C. Electrical signals
Impulses are electrical charges called action potentials that propagate along the neuron membrane. This movement involves the exchange of sodium and potassium ions. The speed of these signals can reach over 100 meters per second.
Which part of the brain serves as a relay station for all sensory information except smell?
Correct Answer: A. Thalamus
The thalamus sorts and sends sensory data to the appropriate areas of the cerebral cortex. It plays a key role in sleep, wakefulness, and consciousness. It is often described as the 'gatekeeper' of the brain.
The gray matter of the brain contains high concentrations of?
Correct Answer: C. Cell bodies and dendrites
Gray matter is composed primarily of neuronal cell bodies and unmyelinated fibers. It is where processing and computation in the brain take place. In the brain, gray matter is mostly on the outer layer called the cortex.
The parasympathetic nervous system is most active during?
Correct Answer: D. Rest and digestion
The parasympathetic system promotes 'Rest and Digest' activities to conserve energy. It slows the heart rate and increases intestinal and gland activity. It helps return the body to a normal state after a stress response.
Which lobe of the cerebrum is primarily involved in processing auditory information?
Correct Answer: B. Temporal lobe
The temporal lobe is located on the sides of the brain near the ears. It is essential for hearing, language comprehension, and memory storage. It contains the primary auditory cortex.
How many pairs of spinal nerves are found in the human body?
Correct Answer: D. 31 pairs
The 31 pairs of spinal nerves connect the spinal cord to the rest of the body. They are named according to the region of the vertebral column they emerge from. These are mixed nerves carrying both sensory and motor information.
Which part of the brain is responsible for visual processing?
Correct Answer: B. Occipital lobe
The occipital lobe is located at the back of the brain. It is the visual processing center containing the primary visual cortex. Damage to this area can result in partial or total blindness.
What is the primary function of the Somatic Nervous System?
Correct Answer: D. Voluntary muscle control
The somatic nervous system carries signals from the CNS to the skeletal muscles. It allows humans to perform conscious movements like walking and writing. It also carries sensory information back to the central nervous system.
The 'all-or-none' law in the nervous system states that?
Correct Answer: C. A neuron fires completely or not at all
The 'all-or-none' law means that once a stimulus reaches a threshold, a full impulse is sent. There is no such thing as a partial nerve impulse. The strength of a sensation depends on the frequency of impulses, not their size.