1. A muscle fiber typically has only one endplate, and eachendplate potential has an amplitude greater than the thresholdlevel of depolarization. Central neurons have hundreds andthousands of synapses, and the EPSP of individual synapsesdoes not reach the threshold level. What is the physiologicalsignificance of these differences?

Answered: 1. A muscle fiber typically has only…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

1. A muscle fiber typically has only one endplate, and each
endplate potential has an amplitude greater than the threshold
level of depolarization. Central neurons have hundreds and
thousands of synapses, and the EPSP of individual synapses
does not reach the threshold level. What is the physiological
significance of these differences?

Expert Solution

Step 1 Introduction:

Muscle fiber is a single, cylindrical muscle cell that is multinucleated and contains many myofibrils. Each myofibril is made up of sarcomeres, which are the basic contractile units of muscle cells. The Sarcomere is the smallest functional unit of a muscle fiber. Made up of thick and thin filaments, the sarcomere is what gives muscle its striated appearance when viewed under a microscope.