img139 - Chapter 8a(7a-ncw edition Nerve cells and...

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Unformatted text preview: Chapter 8a (7a-ncw edition): Nerve cells and electrical signaling. Four multiple- choice questions are assigned to this section. Opening screen: In this learning module we will begin our exploration about how the body communicates via the nervous system. Neurons communicate by an electrical current They send these electrical signals to other neurons, muscles and glands. 9 mm.mmmmmmmm mmmnmmmmm. ”UH-“Wm on... Click the Goals Button: This learning "W“ m“: m aw p02 Lemme modules provides a general understanding of the nervous system, the basic anatomy of a neuron, and * Mb... w W W. mm m... how ions move across the membrane .rd th- dnction at Ilium-lion Mn and M Ilium * ”mm" "W '“’°'"'°""""°"‘ Click the Home Menu Button * Elpldn "It kale but: 0'” min m Md-Wmmmdmmm N S Click the Orientation Button: The nervous consists of: l) the central nervous system (brain and CN 5 fl> spinal cord) and 2) the peripheral nervous system. PM 5 E Eire The CNS monitors the external environment (sensory information), internal environment (visceral information) and somau‘c senses (muscle information). Information is sent to the CNS via afferent neurons where it is integrated and appropriate actions determine. The CNS then sends instructions to the appropriate effector organs. C M: 3: v 2}: beard V t l . . ( sex s Click the Home Menu Button . (M62; )2” W, C \J i Sqfctl W“ W“""""""" Go to the next screen: The PNS communicates . 52:22:52 " "(:3 nan-.- between the CNS and the body’s organs. Effector organs (usually muscles and glands) will then respond. G0 to the next screen: The efferent division is further subdivided into the somatic and autonomic nervous systems. G0 to the next screen: Somatic nervous system consists of motor neurons that regulate muscle “Md am contraction. G0 to the next screen: The autonomic nervous is divided into the parasympathetic and the sympathetic nervous systems that usually have opposite effects on organs such as cardiac muscle, smooth muscle and glands. GO to the next screen: There is also an enteric nervous system consisting of a network of neurons in the GI tract that can function independently of the rest of the nervous system but communicates with the autonomic nervous system. Page 1 of 5 ...
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