SEELEY'S ANATOMY+PHYSIOLOGY
12th Edition
ISBN: 9781260172195
Author: VanPutte
Publisher: RENT MCG
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Chapter 11.5, Problem 44AYP
Summary Introduction
(a)
To determine:
The comparison of action potential conduction’s speed in heavily myelinated, light myelinated, and unmyelinated axons.
Introduction:
The action potential is produced by the local potential. Local potentials are the unit of an action potential, and these local potentials summate at trigger zone for the formation of an action potential.
Summary Introduction
(b)
To determine:
The comparison of action potential conduction’s speed in large and small-diameter axons.
Introduction:
The action potential is produced by the local potentials. The diameter of axons also plays an important role in determining the speed of action potential conduction.
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Why are action potentials usually conducted in one direction?(A) Ions can flow along the axon in only one direction.(B) The brief refractory period prevents reopening of voltagegated Na+channels.(C) The axon hillock has a higher membrane potential thanthe terminals of the axon.(D) Voltage-gated channels for both Na+and K+open in onlyone direction.
During the refractory period
a) if a neuron reaches threshold the action potential goes to completion
b) No stimulus of any strength will trigger a new action potential
c) It is possible to trigger a new action potential but only with an unusually strong stimulus
d) The signal grows weaker with distance
e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold
a) Describe the behavior of an unaffected neuron sitting at its membrane resting potentialstimulated by a suprathreshold stimulus.b) Now, add the effects of the consumption of the Fugu toxin and stimulate that neuron with a supra-threshold stimulus.- Describe (and/or diagram) the effect on the membrane potential by supra-thresholdstimulation under this condition.c. Using any ONE (1) of the following three (3) means we have used to interpret the resultingmembrane potential for a neuron, describe the effect of the Fugu toxin on a neuron:i) Goldman’s equationii) “Driving” toward Ex of most permeable ioniii) Movement/flow of charge + charges
Chapter 11 Solutions
SEELEY'S ANATOMY+PHYSIOLOGY
Ch. 11.1 - List and give examples of the general functions of...Ch. 11.2 - Name the components of the CNS and the PNS.Ch. 11.2 - What are the following: sensory receptor, nerve,...Ch. 11.2 - Based on the direction they transmit action...Ch. 11.2 - Based on the structures they supply, what are the...Ch. 11.2 - Where are the cell bodies of sensory, somatic...Ch. 11.2 - What are the subcategories of the ANS?Ch. 11.2 - Compare the general functions of the CNS and the...Ch. 11.3 - Describe and give the function of a neuron cell...Ch. 11.3 - What is the function of the trigger zone?
Ch. 11.3 - Prob. 11AYPCh. 11.3 - Describe the three types of neurons based on...Ch. 11.3 - Prob. 13AYPCh. 11.3 - What characteristic makes glial cells different...Ch. 11.3 - Which glial cells are found in the CNS? In the...Ch. 11.3 - Which type of glial cell Supports neurons and...Ch. 11.3 - Name the different kinds of glial cells that ore...Ch. 11.3 - Prob. 18AYPCh. 11.3 - How do myelinated axons differ from unmyelinated...Ch. 11.4 - What makes up gray matter and white matter?Ch. 11.4 - Prob. 21AYPCh. 11.5 - Describe the concentration differences for Na+ and...Ch. 11.5 - Prob. 23AYPCh. 11.5 - Describe leak ion channels and go ted ion...Ch. 11.5 - Define ligand, receptor, and receptor site.Ch. 11.5 - What kinds of stimuli cause gated ion channels to...Ch. 11.5 - Prob. 27AYPCh. 11.5 - Prob. 28AYPCh. 11.5 - Prob. 29AYPCh. 11.5 - What happens to cause depolarization and...Ch. 11.5 - Prob. 31AYPCh. 11.5 - Prob. 32AYPCh. 11.5 - How does on action potential differ from a local...Ch. 11.5 - Prob. 34AYPCh. 11.5 - Prob. 35AYPCh. 11.5 - Prob. 36AYPCh. 11.5 - Prob. 37AYPCh. 11.5 - Prob. 38AYPCh. 11.5 - What is action potential frequency? What two...Ch. 11.5 - Describe sub-threshold threshold, maximal,...Ch. 11.5 - Prob. 41AYPCh. 11.5 - What prevents on action potential from reversing...Ch. 11.5 - Prob. 43AYPCh. 11.5 - Prob. 44AYPCh. 11.5 - Prob. 45AYPCh. 11.6 - What are the components of a synapse? What is the...Ch. 11.6 - What is on electrical synapse? Describe its...Ch. 11.6 - Describe the release of neurotransmitter In a...Ch. 11.6 - Prob. 49AYPCh. 11.6 - Prob. 50AYPCh. 11.6 - Prob. 51AYPCh. 11.6 - Explain the production of EPSPs and IPSPs. Why are...Ch. 11.6 - Prob. 53AYPCh. 11.6 - Prob. 54AYPCh. 11.6 - Prob. 55AYPCh. 11.6 - Prob. 56AYPCh. 11.7 - Diagram a convergent pathway, a divergent pathway,...Ch. 11 - The part of the nervous system that controls...Ch. 11 - Motor neurons and interneurons are _______...Ch. 11 - Cells found in the choroid plexuses that secrete...Ch. 11 - Glial cells that are phagocytic within the central...Ch. 11 - Action potentials are conducted more rapidly In...Ch. 11 - Clusters of neuron cell bodies within the...Ch. 11 - Prob. 7RACCh. 11 - Prob. 8RACCh. 11 - Compared with the inside of the resting plasma...Ch. 11 - Prob. 10RACCh. 11 - Prob. 11RACCh. 11 - If the permeability of the plasma membrane to K+...Ch. 11 - Decreasing the extracellular concentration of K+...Ch. 11 - Prob. 14RACCh. 11 - Which of these statements about ion movement...Ch. 11 - Prob. 16RACCh. 11 - Graded potentials a. spread over the plasma...Ch. 11 - During the depolarization phase of an action...Ch. 11 - Prob. 19RACCh. 11 - Prob. 20RACCh. 11 - Prob. 21RACCh. 11 - Neurotransmitter substances are stored in vesicles...Ch. 11 - In a chemical synapse, Action potentials in the...Ch. 11 - An inhibitory presynaptic neuron can affect a...Ch. 11 - Summation Is caused by combining two or more...Ch. 11 - In convergent pathways. a. the response of the...Ch. 11 - A child eats a whole bottle of salt (NaCl)...Ch. 11 - Prob. 2CTCh. 11 - Prob. 3CTCh. 11 - Prob. 4CTCh. 11 - The speed of action potential propagation and...Ch. 11 - Prob. 6CTCh. 11 - Strychnine blocks receptor sites for inhibitory...Ch. 11 - Prob. 8CTCh. 11 - Prob. 9CTCh. 11 - Prob. 10CT
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- A common feature of action potentials is that they(A) cause the membrane to hyperpolarize and then depolarize.(B) can undergo temporal and spatial summation.(C) are triggered by a depolarization that reaches threshold.(D) move at the same speed along all axons.arrow_forwardAction potentials move along different axons at different speeds. The slowest speed of conduction will be found in A) large unmyelinated axons B) small unmyelinated axons C) large myelinated axons D) small myelinated axonsarrow_forwardAction potentials and graded potentials both…A) Propagate long distances through neural structures, without attenuation in their amplitude.B) Can directly excite or inhibit neurons.C) Can propagate at speeds of up to 120 meters per second.D) Involve voltage-gated Nav and Kv channels.E) Are capable of triggering synaptic exocytosis in neurons of the vertebrate retinaarrow_forward
- Depolarization of a neuron plasma membrane will shift the membrane potential toward (a) 0 mV. (b) -70 mV. (c) -90 mV. (d) a, b, and c are correct.arrow_forwardWhich of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.arrow_forward(b) Use Figure Q1(b) of an action potential to answer questions (i) until (iv) below. Choose the correct letter to represent each condition. (i) The neuron cannot fire an action potential because it is in a refractory period. (ii) The membrane potential is about -70 mV. (iii) The voltage-gated Na+ channels activation gates are closed, but the inactivation gates are open. (iv) Both gates of the voltage-gated Na+ channels are open. C Threshold B A E Figure Q1 (b)arrow_forward
- Local anesthetic is often used in dentistry to lessen the sensation of pain during dental procedures. It prevents propagation of nerve conduction by decreasing the flow of ions. a. Describe how depolarization of an action potential can be blocked by the use of local anesthetic. b. Your classmate explained that once the threshold potential has been reached, the inside charge of the neuron is more positive than the outside charge. Is she correct? Can you compare the inside charge to the outside charge in an axon treated with local anesthetic?arrow_forwardBoth electrical and chemical synapses trigger passage of ions across the post-synaptic membrane. (i) Which one of these synapses also allows passage of molecules other than ions across the post-synaptic membrane? (ii) What purpose does an electrical synapse serve? A. Electrical synapse; (ii) dissociate neuronal firing among a group of neurons B. Chemical synapse, (ii) to synthesize IP3 C. (i) Chemical synapse, (ii) slow neurotransmission D. Chemical synapse, (ii) silence neuronal firing O E. (i) Electrical synapse, (ii) fast neurotransmission for synchronized firingarrow_forward1) Draw a pseudo-unipolar neuron synapsing onto a dendrite on a multi-polar neuron. Label the cell body on both neurons and the synaptic cleft. 2) Draw a typical neuron and the relative ion concentrations (high or low) for Na+ and K+ inside and outside the cell. 3) If a cation channel suddenly opened at rest which direction would K+ move and why? Which way would Na+ ions move? 2arrow_forward
- What happens when a resting neuron’s membranedepolarizes?(A) There is a net diffusion of Na+out of the cell.(B) The equilibrium potential for K+(EK) becomesmore positive.(C) The neuron’s membrane voltage becomesmore positive.(D) The cell’s inside is more negative than the outsidearrow_forwardIdentify and label the following structures on the neuron model figure below: cell body, dendrites, neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath, axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer to Figure 10.6). 3) 11arrow_forwardIn a myelinated axon a special form of propagation occurs known as saltatory conduction. a). Explain how this form of propagation occurs? b). What is the main benefit of this form of propagation?arrow_forward
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