Practice free Neural Control and Coordination in Animals (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What is the primary role of neurotransmitters in a chemical synapse?
Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses. They are released from the pre-synaptic neuron, diffuse across the synaptic cleft, and bind to receptors on the post-synaptic neuron, thereby continuing the impulse.
Where are neurotransmitters synthesized and stored within a neuron?
The axon terminals contain vesicles filled with these neurotransmitters. These vesicles are vital for the storage and eventual release of neurotransmitters.
The junction formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron is called a:
A nerve impulse is transmitted from one neuron to another through junctions called synapses. A synapse is formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron.
Which of the following is a key difference between electrical and chemical synapses?
At electrical synapses, electrical current can flow directly from one neuron into the other. At a chemical synapse, chemicals called neurotransmitters are involved in the transmission of impulses. This highlights the fundamental difference in their transmission mechanism.
During the process of synaptic transmission at a chemical synapse, after neurotransmitters are released into the synaptic cleft, what is their immediate next action?
Once neurotransmitters are released into the synaptic cleft due to the fusion of vesicles with the pre-synaptic membrane, they diffuse across the cleft and bind to specific receptors present on the post-synaptic membrane to induce a response.
Match List I with List II with respect to human eye:
| List I | List II |
|---|---|
| A. Fovea | I. Visible coloured portion of eye that regulates diameter of pupil |
| B. Iris | II. External layer of eye formed of dense connective tissue |
| C. Blind spot | III. Point of greatest visual acuity or resolution |
| D. Sclera | IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent |
Fovea → acuity; Iris → pupil control; Blind spot → no photoreceptors; Sclera → outer dense CT.
The parts of human brain that helps in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:
Limbic system + hypothalamus regulate emotion, motivation and sexual behaviour.
Match List I with List II:
| List I | List II |
|---|---|
| A. Pons | I. Provides additional space for Neurons, regulates posture and balance |
| B. Hypothalamus | II. Controls respiration and gastric secretions |
| C. Medulla | III. Connects different regions of the brain |
| D. Cerebellum | IV. Neuro secretory cells |
Choose the correct answer from the options given below:
Pons literally means "bridge" — connects brain regions. Hypothalamus contains neurosecretory cells. Medulla controls respiration. Cerebellum manages posture and balance.
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:
Brain stem = medulla + pons + midbrain (not cerebrum). Statement II is incorrect.
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