Biology (MindTap Course List)
Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 43, Problem 6TYU
Summary Introduction

Introduction: Eye can detect and convert light into electrochemical impulses which are transmitted to the brain through optic nerves which result into the formation of an image on the retina. The human eye consists of iris, cornea, pupil, lens, retina, and light sensitive receptor proteins, such as rhodopsin. Rhodopsin is found in rods of the retina and is a G-protein-coupled protein (GPCR). It is very sensitive to light and involves in visual phototransduction.

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- Which type of cell transmits signals to the central nervous system?1- efferent neurons2- interneurons3- motor neurons4- afferent neurons - Sensory transduction involves1- converting a stimulus into a membrane potential2- sending brain instructions to motor neurons3- the central but not the peripheral nervous system4- converting a stimulus into  neurotransmitter - When light hits the rods and cones in our eyes1- it alters the shape of a protein called retinal2- it causes Ca+ channels to open3- it causes K+ channels to open4- it causes them to depolarize - In mammals, both hearing and equilibrium involve 1- chemoreceptors2- retinal3- mechanoreceptors4- electromagnetic receptors
2. Neurons use action potentials to send information down the axon to stimulate a release of a chemical message for synaptic signalling. (a) Define action potential: (b) What triggers an action potential to occur? (c) Describe the four key steps involved in the generation of an action potential. Complete the task using a graph with membrane potential (mV) on the y-axis and time (ms) on the x-axis. Start with what happens when the membrane potential reaches threshold. For each step, note which channels are opening and closing, the direction of flow of ions across the plasma membrane, and the membrane potential at which this occurs. 3. Both the nervous system and the endocrine system work in parallel to maintain homeostasis around the body. Complete the table below comparing the two systems: Feature Tissue type Signal Signal pathway Nervous system Endocrine System
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Nervous System - Get to know our nervous system a bit closer, how does it works? | Neurology; Author: FreeMedEducation;https://www.youtube.com/watch?v=6O-0CVAgaEM;License: Standard youtube license