Homework Answers
Ans is (c ) myelin sheath creates an insulating layer
Around the axon which keeps Na+/K+ ions from leaking across the membrane
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around the axon, which keeps Na Kions from leaking across the membrane. The create(s) an O...
Which of the following statements about action potentials is incorrect? O a) During an action potential,...
Which of the following statements about action potentials is incorrect? O a) During an action potential, the efflux of Kions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolariza D U E)Kions continue to efflux after resting membrane is reached to cause repolarization ause
In addition to glucose, a muscle can also use as second source of energy for sustained...
In addition to glucose, a muscle can also use as second source of energy for sustained exercise? Which of the following is NOT true of action potential frequency? Creatine phosphate in the muscle is used to Select one: O a. Regenerate ATP from ADP b. Breakdown of glucose to make Select one: O a. Creatine phosphate O b. Fatty acids O c. insulin ATP Select one: O a. A subthreshold stimulus will not produce an action potential O b. A...
Section 1 Answer the multiple-choice questions 1-46 on the scantron. 1. Rapid impulse conduction from "node" to "node" (node of Ranvier) is called: A) spatial propagation. B) salt...
Section 1 Answer the multiple-choice questions 1-46 on the scantron. 1. Rapid impulse conduction from "node" to "node" (node of Ranvier) is called: A) spatial propagation. B) saltatory propagation. C) divergent propagation. D) synaptic transmission. E) continuous propagation. 2. Nerve cells control skeletal muscles by using A) the cranial nerves only B) plasma cells C) the spinal nerves only D) electrical impulses E) none of the above 3. The term "voltage regulated" channels means that the membrane ion channels open...
3. Label each of the parts of a neuron below. Include the axon, axon terminal, dend...
3. Label each of the parts of a neuron below. Include the axon, axon terminal, dend on below. Include the axon, axon terminal, dendrite, cell body, myelin sheath, and nucleus. bul 4. Which portion of the neuron receives incoming signals? Which part conducts signals away from the cell body? 5. Compare the function of sensory neurons, motor neurons, and interneurons 6. Label depolarization, hyperpolarization, peak action potential, resting potential, Na/K ATP pump. +30 Membrane potential (mv) Time 8. What are...
Lo 10: Electrochemical Gradient The difference in voltage across the membrane is called the __________________________________. The...
Lo 10: Electrochemical Gradient The difference in voltage across the membrane is called the __________________________________. The inside of a normal cell is ___________________ (+/-); while the outside is ___________(+/-). The resting membrane potential of a neuron is ___________mV. Diagram the relative ratios of Ca++, Na+ and K+ in a cell under resting conditions. Draw an arrow for each of the molecules indicating which direction would be passive transport (into or out of the cell). For each of the following sentences, fill in...
According to Scott Freeman, 1. Which of the 2 factors listed, best determine the membrane potential...
According to Scott Freeman, 1. Which of the 2 factors listed, best determine the membrane potential of a neuron? a. concentration gradient across the membrane b. charge gradient across the membrane c. the surface area of a neuronal membrane d. the threshold potential of the membrane 2. In a single neuron, what is the typical direction of signals? a. axon to dendrite to cell body b. dendrite to cell body to axon c. axon to cell body to dendrite 3....
41. Schwann cells are associated with: a. Nodes of Ranvier b. Myelin sheath c. Unmyelinated axons d. Synaptic cleft...
41. Schwann cells are associated with: a. Nodes of Ranvier b. Myelin sheath c. Unmyelinated axons d. Synaptic cleft 42. A synapse does not involve the: a. Presynaptic neuron b. Postsynaptic neuron c Cell body d. Involvement of calcium 43. Which of following is not a connective tissue? a cardiac muscle b. cartilage c blood d. adipose 44. The type of gland that secretes substances into circulatory system are called: a. Exocrine glands b. Endocrine glands c. Simple glands d....
1. What channels or carriers are NOT found at the axon to the axon terminal? Select...
1. What channels or carriers are NOT found at the axon to the axon terminal? Select one: a. Na+ leaky channels b. Cl- gated channels c. Na+ gated channels d. Na+-K+ ATPase e. None of the above 2. What is TRUE about action potential in the neuron? There may be more than one answer. Select one or more: a. At resting membrane potential (-70mV), the inactivation gate of the Na+ channel is closed while the activation gate is opened. b....
(OHow does the relative permeability of the membrane to Na and K throughout the course of...
(OHow does the relative permeability of the membrane to Na and K throughout the course of the action potential change compared with that at the resting membrane potential? From the following, select the statement(s) which are CORRECT: Select one or more: a. The number of potassium voltage-gated channels that open determine the amplitude of the action potential b. During the peak of an action potential, there is a 500x increase in the concentration of Na+ that move into the cell....
for each, what is the right answer? 30. When a neuron encodes the strength of a...
for
each, what is the right answer?
30. When a neuron encodes the strength of a stimulus, it does so by changing A) the frequency of action potentials. B) the duration of each action potential C) the polarity of every alternate action potential. D) the size of each action potential E) the direction of the action potentials along the axon. 31. The relative refractory period of an axon begins with A) activation of chemically-gated K+ channels. B) increasing Na+ flux...
Which of the following statements about action potentials is incorrect? O a) During an action potential, the efflux of Kions causes the inside of cells to become more positive (depolarized). B) When critical threshold is reached an action potential is triggered C) Voltage gated channels are required to reach critical threshold D) Sodium ions diffuse across the membrane to cause depolariza D U E)Kions continue to efflux after resting membrane is reached to cause repolarization ause
In addition to glucose, a muscle can also use as second source of energy for sustained exercise? Which of the following is NOT true of action potential frequency? Creatine phosphate in the muscle is used to Select one: O a. Regenerate ATP from ADP b. Breakdown of glucose to make Select one: O a. Creatine phosphate O b. Fatty acids O c. insulin ATP Select one: O a. A subthreshold stimulus will not produce an action potential O b. A...
Section 1 Answer the multiple-choice questions 1-46 on the scantron. 1. Rapid impulse conduction from "node" to "node" (node of Ranvier) is called: A) spatial propagation. B) saltatory propagation. C) divergent propagation. D) synaptic transmission. E) continuous propagation. 2. Nerve cells control skeletal muscles by using A) the cranial nerves only B) plasma cells C) the spinal nerves only D) electrical impulses E) none of the above 3. The term "voltage regulated" channels means that the membrane ion channels open...
3. Label each of the parts of a neuron below. Include the axon, axon terminal, dend on below. Include the axon, axon terminal, dendrite, cell body, myelin sheath, and nucleus. bul 4. Which portion of the neuron receives incoming signals? Which part conducts signals away from the cell body? 5. Compare the function of sensory neurons, motor neurons, and interneurons 6. Label depolarization, hyperpolarization, peak action potential, resting potential, Na/K ATP pump. +30 Membrane potential (mv) Time 8. What are...
41. Schwann cells are associated with: a. Nodes of Ranvier b. Myelin sheath c. Unmyelinated axons d. Synaptic cleft 42. A synapse does not involve the: a. Presynaptic neuron b. Postsynaptic neuron c Cell body d. Involvement of calcium 43. Which of following is not a connective tissue? a cardiac muscle b. cartilage c blood d. adipose 44. The type of gland that secretes substances into circulatory system are called: a. Exocrine glands b. Endocrine glands c. Simple glands d....
(OHow does the relative permeability of the membrane to Na and K throughout the course of the action potential change compared with that at the resting membrane potential? From the following, select the statement(s) which are CORRECT: Select one or more: a. The number of potassium voltage-gated channels that open determine the amplitude of the action potential b. During the peak of an action potential, there is a 500x increase in the concentration of Na+ that move into the cell....
for
each, what is the right answer?
30. When a neuron encodes the strength of a stimulus, it does so by changing A) the frequency of action potentials. B) the duration of each action potential C) the polarity of every alternate action potential. D) the size of each action potential E) the direction of the action potentials along the axon. 31. The relative refractory period of an axon begins with A) activation of chemically-gated K+ channels. B) increasing Na+ flux...
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