NEET Zoology Neural Control And Coordination Class 11 Questions

Somatic neural system and autonomic neural system are the two divisions of

Transmission of a nerve impulse across is very similar to impulse conduction along a single axon.

Upon arrival of a stimulus, the polarised state of a resting neuronal membrane is reversed by

How many pairs of cranial nerves are present in frog

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system?

Assertion: Axoplasm inside the axon contains high concentration of K⁺ low concentration of Na⁺ when neuron is not conducting any impulse. Reason: The axonal membrane is comparatively more permeable to potassium ions (K⁺) and nearly impermeable to sodium ions (Na⁺).

The part of brain with the great influence over the endocrine system is

Match column I with column II and choose the correct option.

The factor responsible for repolarisation of an axonal membrane is

Neurotransmitters, released by the presynaptic neurons bind to the receptors on the

A man is admitted to a hospital. He is suffering from an abnormally low body temperature, loss of appetite and extreme thirst. His brain scan would probably show a tumor in

Read the following statements and answer as directed afterwards. 1. Sodium-potassium pump helps in maintaining the resting membrane potential across the resting membrane or axolemma 2. Sodium-potassium pump works against the concentration gradient. 3. Sodium-potassium pump transports 3 sodium ions outwards for 2 potassium ions into the cell. How many of the above statements are correct.

What would an injury localized to the hypothalamus most likely disrupt?

How many statements are correct for resting state of axon? (i) The axoplasm inside the axon contains high concentration of K⁺ and negatively charged proteins and low concentration of Na⁺. (ii) In contrast, the fluid outside the axon contains a low concentration of K⁺, a high concentration of Na⁺ and thus form a concentration gradient. (iii) The outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged. (iv) The electrical potential difference across the resting plasma membrane is called as the resting potential. (v) Resting stage is depolarised state. (vi) Resting potential is positive potential.

Match List I with List II:

Given below are two statements: Statement I: The cerebral hemispheres are connected by nerve tract known as corpus callosum. Statement II: The brain stem consists of the medulla oblongata, pons and cerebrum. In the light of the above statements, choose the most appropriate answer from the options given below:

The parts of human brain that helps in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:

Select the incorrect statement regarding synapses: (A) Chemical synapses use neurotransmitters (B) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. (C) The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse. (D) Electrical current can flow directly from one neuron into the other across the electrical synapse.

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

Which part of the brain is responsible for thermoregulation?

Nissl’s bodies are mainly composed of

Which of the following structures or regions is INCORRECTLY paired with its functions?

Myelin sheath is produced by

Receptor sites for neurotransmitters are present on

Which of the following regions of the brain is INCORRECTLY paired with its function?

Stimulation of a muscle fibre by a motor neuron occurs at

How do parasympathetic neural signals affect the working of the heart?

Which one of the following statements is NOT CORRECT?

The figure shows an axon terminal and synapse. Select the option giving correct identifications of labels i-iv:

A sagittal section of human brain is shown here. Identify at least two labels from i-iv: