Biology

Nervous System and Neurons

1,224 Questions

The nervous system and neurons section covers the structural and functional aspects of the human nervous system. Topics include nerve fibers, the myelin sheath, and sympathetic nervous system functions. This material is crucial for general science preparation in various competitive exams.

Neuron structureMyelin sheath productionSympathetic nervous systemCranial and spinal nervesParasympathetic functions

Nervous System and Neurons Questions

Multiple choice

A neuromuscular junction is a specialised synapse between a neuron and the muscle it innervates. Which of the following diseases is caused by auto-antibodies to voltage gated calcium channels at the presynaptic side of the neuromuscular junction that leads to a reduction in the amount of acetylcholine released from nerve terminals?

  1. Congenital myasthenia

  2. LEMS (Lambert-Eaton myasthenic syndrome)

  3. Myasthenia gravis

  4. Neuromyotonia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Muscle weakness in LEMS is caused by auto-antibodies to voltage gated calcium channels at the presynaptic side of the neuromuscular junction.

Multiple choice

Many nerve fibres are bound together by the __________ to make up a nerve.

  1. nervous tissue

  2. epithelial tissue

  3. connective tissue

  4. muscular tissue

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The brain, spinal cord and nerves are all composed of the nervous tissue. The cells of this tissue are called nerve cells or neurons. Many nerve fibres bound together by the connective tissue make up a nerve.

Multiple choice

Which of the following nerves innervates the human penis?

  1. Labialscrotal nerve

  2. Sciatic nerve

  3. Sacral nerves 2, 3 and 4

  4. Genitofemoral nerve

  5. Sacral spinal nerve
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Innervation of the penis comes from the pudendal nerve, which is made up of the 2nd, 3rd and 4th sacral nerves. The penile nerve (also known as the dorsal nerve of the penis) is the deepest branch of the pudendal nerve.

Multiple choice

The regulation of the homeostatic function is accomplished by

  1. Autonomic nervous system

  2. Peripheral nervous system

  3. Central nervous system

  4. none of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The autonomic nervous system is responsible for regulating involuntary bodily functions, such as heart rate and digestion, which are essential for maintaining homeostasis. The central and peripheral systems are broader categories that include both voluntary and involuntary control.

Multiple choice

What sensory pathway carries light touch and proprioception?

  1. Medial lemniscus

  2. Lateral lemniscus

  3. Spinothalamic trac

  4. Chorda tympani

  5. Corticospinal tract
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The medial lemniscus carries sensory information from the gracile and cuneate nuclei to the thalamus. It is part of the posterior column-medial lemniscus system, which transmits touch, vibration sense as well as the pathway for proprioception.

Multiple choice

The tissues consisting of nerve cells is:

  1. nerve tissue

  2. epithelial tissue

  3. connective tissue

  4. muscle tissue
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A tissue which is specialized to transmit messages in our body is nervous tissue. Brain, spinal cord, and nerves are all composed of nerves tissue. Nervous tissue contains highly specialised unit cells called nerve cells. Nerve cells have the ability to receive stimuli from within or outside the body and conduct to different parts of the body. the impulses travels from one nerve cells to another nerve cell

Multiple choice

Brain, spinal cord, and nerves are made up of:

  1. connective tissue

  2. epithelial tissue

  3. nerve tissue

  4. muscle tissue
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A tissue which is specialized to transmit messages in our body is nervous tissue. Brain, spinal cord, and nerves are all composed of nerves tissue. Nervous tissue contains highly specialised unit cells called nerve cells. Nerve cells have the ability to receive stimuli from within or outside the body and conduct to different parts of the body. the impulses travels from one nerve cells to another nerve cell

Multiple choice

The dendrites & the axon are the part of

  1. Epithelial tissue

  2. Nerve tissue

  3. Connective tissue

  4. Muscle tissue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A tissue which is specialized to transmit messages in our body is nervous tissue. Brain, spinal cord, and nerves are all composed of nerves tissue. Nervous tissue contains highly specialised unit cells called nerve cells. Nerve cells have the ability to receive stimuli from within or outside the body and conduct to different parts of the body. the impulses travels from one nerve cells to another nerve cell.The dendrites of the nerve cell receives impulse & the axon of the nerve cell take impulses away from the cell body.

Multiple choice

Fatty covering myelin sheaths are found

  1. surrounding the tendons

  2. covering the muscles

  3. around axone of neurons

  4. covering the brain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Myelin sheaths are found around the axone of some  neurones.

Multiple choice

Control unit is often called as

  1. Nerve Center

  2. Master Dispatcher

  3. Clock

  4. All of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The control unit is often referred to as the 'nerve center' or 'master dispatcher' of the CPU because it coordinates the activities of all other components.