(a) Resting membrane potential is the potential difference existing in a resting neuron (unstimulated neuron). During resting condition, the concentration of ${{\text{K}}^{+}}$ions is more inside the axoplasm while the concentration of $\text{N}{{\text{a}}^{+}}$ions is more outside the axoplasm. As a result, the potassium ions move faster from inside to outside as compared to sodium ions. Therefore, the membrane becomes positively charged outside and negatively charged inside. This is known as polarization of membrane or polarized nerve.
NCERT Page-317
Neural Control and Coordination
285056
During the propagation of a nerve impulse, the action potential results from the movement of
1 $\text{N}{{\text{a}}^{+}}$ions from extracellular fluid to intracellular fluid.
2 ${{\text{K}}^{+}}$ions from extracellular fluid to intracellular fluid.
3 $\text{N}{{\text{a}}^{+}}$ions from intracellular fluid to extracellular fluid.
4 ${{\text{K}}^{+}}$ions from intracellular fluid to extracellular fluid.
Explanation:
(a) Action potentials are formed when a stimulus causes the cell membrane to depolarize the threshold of excitation, causing all sodium ion channels to open. During the propagation of a nerve impulse, the action potential results from the movement of $\text{N}{{\text{a}}^{+}}$ions from the extracellular fluid to intracellular fluid.
NCERT Page-317 / N-232
Neural Control and Coordination
285057
The junction between the axon of one neuron and the dendrite of the next is called
1 junction point
2 a synapse
3 a joint
4 constant bridge
Explanation:
(b) The end-to-end position of the axon of one neuron and the dendrites of another neuron called the synapse.
NCERT Page-319 / N-234
Neural Control and Coordination
285059
How does pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to postsynaptic neuron?
1 Through electrical impulse
2 Through chemical impulse
3 Through neurotransmitters
4 None of the above
Explanation:
(c) Through neurotransmitters pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to post-synaptic neuron.
NCERT Page-319/ N-234
Neural Control and Coordination
285060
Electrical current can flow directly from one neuron into other across the synapses. Which of the following statements is/are correct?
1 Impulse transmission across an electrical synapse is always faster than chemical synapse.
2 Chemical synapse is faster from electrical synapse.
3 Electrical synapse are rare in our system.
4 Both (a) and (c)
Explanation:
(d) Statement (a) and (c) are the correct. So option (d) is correct.
(a) Resting membrane potential is the potential difference existing in a resting neuron (unstimulated neuron). During resting condition, the concentration of ${{\text{K}}^{+}}$ions is more inside the axoplasm while the concentration of $\text{N}{{\text{a}}^{+}}$ions is more outside the axoplasm. As a result, the potassium ions move faster from inside to outside as compared to sodium ions. Therefore, the membrane becomes positively charged outside and negatively charged inside. This is known as polarization of membrane or polarized nerve.
NCERT Page-317
Neural Control and Coordination
285056
During the propagation of a nerve impulse, the action potential results from the movement of
1 $\text{N}{{\text{a}}^{+}}$ions from extracellular fluid to intracellular fluid.
2 ${{\text{K}}^{+}}$ions from extracellular fluid to intracellular fluid.
3 $\text{N}{{\text{a}}^{+}}$ions from intracellular fluid to extracellular fluid.
4 ${{\text{K}}^{+}}$ions from intracellular fluid to extracellular fluid.
Explanation:
(a) Action potentials are formed when a stimulus causes the cell membrane to depolarize the threshold of excitation, causing all sodium ion channels to open. During the propagation of a nerve impulse, the action potential results from the movement of $\text{N}{{\text{a}}^{+}}$ions from the extracellular fluid to intracellular fluid.
NCERT Page-317 / N-232
Neural Control and Coordination
285057
The junction between the axon of one neuron and the dendrite of the next is called
1 junction point
2 a synapse
3 a joint
4 constant bridge
Explanation:
(b) The end-to-end position of the axon of one neuron and the dendrites of another neuron called the synapse.
NCERT Page-319 / N-234
Neural Control and Coordination
285059
How does pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to postsynaptic neuron?
1 Through electrical impulse
2 Through chemical impulse
3 Through neurotransmitters
4 None of the above
Explanation:
(c) Through neurotransmitters pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to post-synaptic neuron.
NCERT Page-319/ N-234
Neural Control and Coordination
285060
Electrical current can flow directly from one neuron into other across the synapses. Which of the following statements is/are correct?
1 Impulse transmission across an electrical synapse is always faster than chemical synapse.
2 Chemical synapse is faster from electrical synapse.
3 Electrical synapse are rare in our system.
4 Both (a) and (c)
Explanation:
(d) Statement (a) and (c) are the correct. So option (d) is correct.
(a) Resting membrane potential is the potential difference existing in a resting neuron (unstimulated neuron). During resting condition, the concentration of ${{\text{K}}^{+}}$ions is more inside the axoplasm while the concentration of $\text{N}{{\text{a}}^{+}}$ions is more outside the axoplasm. As a result, the potassium ions move faster from inside to outside as compared to sodium ions. Therefore, the membrane becomes positively charged outside and negatively charged inside. This is known as polarization of membrane or polarized nerve.
NCERT Page-317
Neural Control and Coordination
285056
During the propagation of a nerve impulse, the action potential results from the movement of
1 $\text{N}{{\text{a}}^{+}}$ions from extracellular fluid to intracellular fluid.
2 ${{\text{K}}^{+}}$ions from extracellular fluid to intracellular fluid.
3 $\text{N}{{\text{a}}^{+}}$ions from intracellular fluid to extracellular fluid.
4 ${{\text{K}}^{+}}$ions from intracellular fluid to extracellular fluid.
Explanation:
(a) Action potentials are formed when a stimulus causes the cell membrane to depolarize the threshold of excitation, causing all sodium ion channels to open. During the propagation of a nerve impulse, the action potential results from the movement of $\text{N}{{\text{a}}^{+}}$ions from the extracellular fluid to intracellular fluid.
NCERT Page-317 / N-232
Neural Control and Coordination
285057
The junction between the axon of one neuron and the dendrite of the next is called
1 junction point
2 a synapse
3 a joint
4 constant bridge
Explanation:
(b) The end-to-end position of the axon of one neuron and the dendrites of another neuron called the synapse.
NCERT Page-319 / N-234
Neural Control and Coordination
285059
How does pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to postsynaptic neuron?
1 Through electrical impulse
2 Through chemical impulse
3 Through neurotransmitters
4 None of the above
Explanation:
(c) Through neurotransmitters pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to post-synaptic neuron.
NCERT Page-319/ N-234
Neural Control and Coordination
285060
Electrical current can flow directly from one neuron into other across the synapses. Which of the following statements is/are correct?
1 Impulse transmission across an electrical synapse is always faster than chemical synapse.
2 Chemical synapse is faster from electrical synapse.
3 Electrical synapse are rare in our system.
4 Both (a) and (c)
Explanation:
(d) Statement (a) and (c) are the correct. So option (d) is correct.
(a) Resting membrane potential is the potential difference existing in a resting neuron (unstimulated neuron). During resting condition, the concentration of ${{\text{K}}^{+}}$ions is more inside the axoplasm while the concentration of $\text{N}{{\text{a}}^{+}}$ions is more outside the axoplasm. As a result, the potassium ions move faster from inside to outside as compared to sodium ions. Therefore, the membrane becomes positively charged outside and negatively charged inside. This is known as polarization of membrane or polarized nerve.
NCERT Page-317
Neural Control and Coordination
285056
During the propagation of a nerve impulse, the action potential results from the movement of
1 $\text{N}{{\text{a}}^{+}}$ions from extracellular fluid to intracellular fluid.
2 ${{\text{K}}^{+}}$ions from extracellular fluid to intracellular fluid.
3 $\text{N}{{\text{a}}^{+}}$ions from intracellular fluid to extracellular fluid.
4 ${{\text{K}}^{+}}$ions from intracellular fluid to extracellular fluid.
Explanation:
(a) Action potentials are formed when a stimulus causes the cell membrane to depolarize the threshold of excitation, causing all sodium ion channels to open. During the propagation of a nerve impulse, the action potential results from the movement of $\text{N}{{\text{a}}^{+}}$ions from the extracellular fluid to intracellular fluid.
NCERT Page-317 / N-232
Neural Control and Coordination
285057
The junction between the axon of one neuron and the dendrite of the next is called
1 junction point
2 a synapse
3 a joint
4 constant bridge
Explanation:
(b) The end-to-end position of the axon of one neuron and the dendrites of another neuron called the synapse.
NCERT Page-319 / N-234
Neural Control and Coordination
285059
How does pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to postsynaptic neuron?
1 Through electrical impulse
2 Through chemical impulse
3 Through neurotransmitters
4 None of the above
Explanation:
(c) Through neurotransmitters pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to post-synaptic neuron.
NCERT Page-319/ N-234
Neural Control and Coordination
285060
Electrical current can flow directly from one neuron into other across the synapses. Which of the following statements is/are correct?
1 Impulse transmission across an electrical synapse is always faster than chemical synapse.
2 Chemical synapse is faster from electrical synapse.
3 Electrical synapse are rare in our system.
4 Both (a) and (c)
Explanation:
(d) Statement (a) and (c) are the correct. So option (d) is correct.
(a) Resting membrane potential is the potential difference existing in a resting neuron (unstimulated neuron). During resting condition, the concentration of ${{\text{K}}^{+}}$ions is more inside the axoplasm while the concentration of $\text{N}{{\text{a}}^{+}}$ions is more outside the axoplasm. As a result, the potassium ions move faster from inside to outside as compared to sodium ions. Therefore, the membrane becomes positively charged outside and negatively charged inside. This is known as polarization of membrane or polarized nerve.
NCERT Page-317
Neural Control and Coordination
285056
During the propagation of a nerve impulse, the action potential results from the movement of
1 $\text{N}{{\text{a}}^{+}}$ions from extracellular fluid to intracellular fluid.
2 ${{\text{K}}^{+}}$ions from extracellular fluid to intracellular fluid.
3 $\text{N}{{\text{a}}^{+}}$ions from intracellular fluid to extracellular fluid.
4 ${{\text{K}}^{+}}$ions from intracellular fluid to extracellular fluid.
Explanation:
(a) Action potentials are formed when a stimulus causes the cell membrane to depolarize the threshold of excitation, causing all sodium ion channels to open. During the propagation of a nerve impulse, the action potential results from the movement of $\text{N}{{\text{a}}^{+}}$ions from the extracellular fluid to intracellular fluid.
NCERT Page-317 / N-232
Neural Control and Coordination
285057
The junction between the axon of one neuron and the dendrite of the next is called
1 junction point
2 a synapse
3 a joint
4 constant bridge
Explanation:
(b) The end-to-end position of the axon of one neuron and the dendrites of another neuron called the synapse.
NCERT Page-319 / N-234
Neural Control and Coordination
285059
How does pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to postsynaptic neuron?
1 Through electrical impulse
2 Through chemical impulse
3 Through neurotransmitters
4 None of the above
Explanation:
(c) Through neurotransmitters pre-synaptic neuron transmits an impulse (action potential) across the synaptic cleft to post-synaptic neuron.
NCERT Page-319/ N-234
Neural Control and Coordination
285060
Electrical current can flow directly from one neuron into other across the synapses. Which of the following statements is/are correct?
1 Impulse transmission across an electrical synapse is always faster than chemical synapse.
2 Chemical synapse is faster from electrical synapse.
3 Electrical synapse are rare in our system.
4 Both (a) and (c)
Explanation:
(d) Statement (a) and (c) are the correct. So option (d) is correct.