Which organelle cannot be found in synaptic knob of a neuron?
Correct answer: D. Nucleus
- A. Mitochondria
- B. Ribosomes
- C. Secretory vesicles
- D. Nucleus
Explanation
The organelle that cannot be found in the synaptic knob of a neuron is the nucleus.The synaptic knob is the bulbous end of a presynaptic axon, where neurotransmitters are stored and released. It contains synaptic vesicles, mitochondria, and other organelles necessary for neurotransmitter release, but not the nucleus.The nucleus is the control center of the cell, and it contains the DNA that codes for the cell's proteins. Since neurons do not divide once they are mature, they do not need a nucleus in the synaptic knob. The other organelles listed, mitochondria, ribosomes, and secretory vesicles, are all present in the synaptic knob. Mitochondria provide energy for neurotransmitter release, ribosomes produce proteins for the synaptic vesicles, and secretory vesicles store and release neurotransmitters. Therefore, the correct answer is nucleus
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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