Answer the questions after observing the diagram given below. What do the synaptic vesicles contain?

The impulse travels along the axon of the pre-synaptic neuron to the dendrites of post-synaptic neuron. Most presynaptic axons have several synaptic knobs at their ends. These knobs have arrays of membranous sacs, called synaptic vesicles, that contain neurotransmitters. When an impulse or action potential reaches a synaptic knob, voltage gated calcium channels open and calcium ions diffuses inward from the extracellular fluid. It initiates a series of events that fuse the synaptic vesicles with the cell membrane, where they release their neurotransmitters by exocytosis. The binding of neurotransmitters to the receptors of the post-synaptic cell leads to the transmission of an impulse.

Answer the questions after observing the diagram given below. What process is used to release the neurotransmitter?

The process is used to release the neurotransmitter is exocytosis. When an impulse or action potential reaches a synaptic knob, voltage gated calcium channels open and calcium ions diffuses inward from the extracellular fluid. It initiates a series of events that fuse the synaptic vesicles with the cell membrane, where they release their neurotransmitters by exocytosis. The binding of neurotransmitters to the receptors of the post-synaptic cell leads to the transmission of an impulse.

Answer the questions after observing the diagram given below. What should be reason for the next impulse to be conducted?

Process of transmission of an action potential across a synapse : The impulse travels along the axon of the pre-synaptic neuron to the dendrites of post-synaptic neuron. Most presynaptic axons have several synaptic knobs which contains synaptic vesicles, that contain neurotransmitters. When an impulse or action potential reaches a synaptic knob, voltage gated calcium channels open and calcium ions diffuses inward from the extracellular fluid. It initiates a series of events that fuse the synaptic vesicles with the cell membrane, where they release their neurotransmitters by exocytosis. The binding of neurotransmitters to the receptors of the post-synaptic cell leads to the transmission of an impulse. Once the impulse has been transferred across the synapse, the neurotransmitter is destroyed by the enzyme like cholinesterase and the synapse is ready to receive a new impulse.

Answer the questions after observing the diagram given below. Will the impulse be carried by postsynaptic membrane even if one presynaptic neuron is there?

There are three components of a typical chemical synapse, named as presynaptic terminal (axonic terminal), synaptic membrane of the post synaptic cell (dendrite of the next neuron) post synaptic neuron. The impulse travels along the axon of the pre-synaptic neuron to the dendrites of post-synaptic neuron. Most presynaptic axons have several synaptic knobs which contains synaptic vesicles, that contain neurotransmitters. When an impulse or action potential reaches a synaptic knob, voltage gated calcium channels open and calcium ions diffuses inward from the extracellular fluid. It initiates a series of events that fuse the synaptic vesicles with the cell membrane, where they release their neurotransmitters by exocytosis. The binding of neurotransmitters to the receptors of the post-synaptic cell leads to the transmission of an impulse. In this way, transmission of nerve impulses through a chemical synapse is unidirectional. Thus, a pre-synaptic neuron is required that releases neurotransmitters and facilitate the transmission of an impulse across the synapse.

E M B I B E

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.6

MEDIUM

12th Maharashtra Board

IMPORTANT

Earn 100

Complete the table

Location Cell type Function

PNS ___ Produce myelin sheath

PNS Satellite cells

_ Oligodendrocytes Form myelin sheath around central axon

CNS _ Phagocytose pathogens

CNS _______ Form the epithelial lining of brain cavities and central canal.

Important Questions on Control and Coordination

HARD

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Draw the neat labelled diagram of Human ear.

HARD

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Draw the neat labelled diagram of the sectional view of Human eye.

MEDIUM

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Draw a neat labelled diagram of a multipolar neuron.

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Explain the process of conduction of nerve impulses upto development of action potential.

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Answer the questions after observing the diagram given below.

Question Image

What do the synaptic vesicles contain?

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Answer the questions after observing the diagram given below.

Question Image

What process is used to release the neurotransmitter?

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Answer the questions after observing the diagram given below.

Question Image

What should be reason for the next impulse to be conducted?

EASY

12th Maharashtra Board

IMPORTANT

Biology Standard 12>Chapter 9 - Control and Coordination>Exercise>Q Q.7

Answer the questions after observing the diagram given below.

Question Image

Will the impulse be carried by postsynaptic membrane even if one presynaptic neuron is there?

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Location	Cell type	Function
PNS	___________	Produce myelin sheath
PNS	Satellite cells	______________
_____________	Oligodendrocytes	Form myelin sheath around central axon
CNS	___________	Phagocytose pathogens
CNS	___________	Form the epithelial lining of brain cavities and central canal.