Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 8, Problem 17RQ
Explain what the “growth cone” that Ross Harrison observed at the ends of growing nerve fibers does to influence direction of nerve growth.
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What did Galvani's first round of frog experiments demonstrate?
A. Nervous tissue is reactive in the presence of no metal
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C. Muscle contraction is dependent on the distance between the nerve and 2 metals
D. Only man-made elecricity could activate a nerve
Construct a unit concept map to show the relationships among the following set of term:
accessory nerve, axillary nerve, brainstem, foramina, hypoglossal nerve, median nerve, posterior rami, radial nerve, skeletal muscle, trochlear nerve.
Describe the relationship between stimulus intensity, frequency of action potentials, and the amount of neurotransmitters released. What term describes this relationship?
Chapter 8 Solutions
Loose Leaf For Integrated Principles Of Zoology
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Ch. 8 - Describe two different experimental approaches...Ch. 8 - What is meant by induction in embryology? Describe...Ch. 8 - What are homeotic genes and what is the homeobox...Ch. 8 - What is the embryological evidence that...Ch. 8 - What are the four extraembryonic membranes of...Ch. 8 - What is the fate of the four extraembryonic...Ch. 8 - Explain what the growth cone that Ross Harrison...Ch. 8 - Name two organ-system derivatives of each of the...Ch. 8 - Prob. 19RQCh. 8 - SCNT makes possible therapeutic cloning. What are...
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- The nerve impulse travels only in one direction, give a reason?arrow_forwardA patient had too much Botox injected into her forehead which caused facial paralysis and tingling, as well as difficulty using her fingers, especially her thumb. Use the graph to help explain the answer.arrow_forwardUsing microelectrodes, a researcher recorded nerve signals in four neurons in the brain . The neurons are called A, B, C, and D in the table below. A, B, and C all can transmit signals to D. In three experiments, the animal was stimulated in different ways. The number of nerve signals transmitted per second by each of the cells is recorded in the table. Write a short paragraph explaining the different results of the three experiment. 09arrow_forward
- Give typing answer with explanation and conclusion How does the neural plate “rise” up from the surrounding presumptive skin cells?arrow_forwardStudies of the infant brain show signs of what scientists call synaptic pruning. What occurs during this process? a. The brain creates additional neural connections by removing parts of the surrounding bone. b. Unused synaptic connections and nerve cells are cleared out to make way for new cells. c. New cells work to “rewrite” old cells and ultimately change their functioning. d. New cells will not develop until the body makes sufficient physical space within the brain.arrow_forwardHow do sensory neurons differ from motor neurons? I. Sensory neurons carry impulses from the receptor to the brain while motor neurons carry impulses from the brain to the effector. II. Sensory neurons carry impulses from the brain to the effector while motor neurons carry impulses from the receptor to the brain. II. Sensory neurons carry impulses triggered by stimulus from the organ to the brain while motor neurons carry processed information from the brain to the organ to response. IV. Sensory neurons carry processed information from the brain to the organ to response while motor neurons carry impulses triggered by stimulus from the organ to the brain. * O I and III only O Il and IV only O I and IV only O Il and III onlyarrow_forward
- Certain cells in the retina respond differently to the direction in which objects move. To understand how cells in the retina respond to different visual stimuli, the activity of a retinal ganglion cell was measured while a square moved across its visual field. Which statement best explains the increases in voltage during the periodic spikes? A. Depolarization of a neuron past a threshold voltage causes sodium channels to close. B. Depolarization of a neuron past a threshold voltage causes sodium channels to open. C. Depolarization of a neuron past a threshold voltage causes potassium channels to close. D. Depolarization of a neuron past a threshold voltage causes potassium channels to open.arrow_forwardWhen Sperry cut a newt’s optic nerve and turned the eye upside down, what happened?A. Axons of the optic nerve grew randomly and attached diffusely to target cells.B. Axons of the optic nerve grew back to their original targets.C. Axons of the optic nerve grew back to targets appropriate to their new location in the eye.D. At first the axons grew back randomly, but then they established appropriate connections by learning.arrow_forwardUse the illustration below to answer questions 7 and 8. 7. Which number represents a dendrite? a) 1 b) 2 c)3 d)4 e) 5 8. What number represents the myelin sheath? a) 1 b)2 c)3 d)4 e) 5arrow_forward
- Many neurotoxins have been used extensively in physiological studies of neurons. When comparing tetrodotoxin found in puffer fish and batrachotoxins from poison dart-frogs, the former had no effect on a neurons resting potential but completely stopped its action potential, whereas the later toxin immediately initiates depolarization of a neuron but prevents repolarization. Can your group hypothesize how these toxins affect the nerve transmission differently?arrow_forwardWhich of these was NOT a theory of a nerve function near the end of the 17th century? A. nerve signal through secreted droplets of fluid B. Nerve signal by actual movement of cells from different body areas C. Spirits running through hollow nerves D. Nerves signal through vibrationsarrow_forwardTo evaluate understanding about the 2 types of ASEPSIS. Kindly illustrate your learning by comparing and contrasting the ideas using a VENN DIAGRAM.arrow_forward
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