Chapter 10 Muscular Tissue Flashcards
what are the general skeletal muscle functions?
- producing body movements
- maintaining posture
- stabilizing joints
- generating heat which contributes to homeostatis
what is thermogenesis?
the skeletal muscles contracting and generating heat which helps maintain body
what are the 3 types of muscle tissue?
- skeletal
- smooth
- cardiac
what are the properties of a muscle tissue?
- electrical excitability (responsiveness) which means they respond to stimulus by generating muscle action potential
- contractibility
- extensibility which allows them to be stretched without being damaged to a certain point
- elasticity which allows them to recoil after being stretched or contracted
what are other terms for a muscle cell, muscle plasma membrane, muscle cell cytoplasm and muscle SER?
muscle cell aka muscle fiber
muscle plasma membrane aka sarcolemma
muscle cell cytoplasm aka sarcoplasm
muscle SER aka sarcoplasmic reticulum
what does muscle tissue convert energy (ATP) into and why?
it converts ATP in mechanical energy to produce movement
is skeletal muscle tissue involuntary or voluntary? which nervous system are they part of? (be specific)
is involuntary control and part of the somatic NS specifically the PNS.
what layer separates the muscle from the skin?
subcutaneous layer.
what is fascia and what does it do for the muscle?
fascia is broad band and dense sheet of irregular CT which is strong and it supports as well as surrounds the muscle
what are the 3 layers of CT coverings that extend from the fascia of the skeletal muscle?
- epimysium is the most outer CT covering which encircles the entire muscle (many fascicles)
- perimysium surrounds a bundle of muscle cells (fascicle)
- endomysium is the most inner CT covering which surrounds individual muscle fibers
what is a mesodermal cell and how does it relate to the muscle?
describe a muscle fiber in two words.
is elongated & multinucleated
why are muscle fibers multi-nucleated?
bc it was created by an embryonic cell called a mesodermal cell. What happens is a bunch of these mesodermal cells fuse together to form one muscle cell and because each of them have a nucleus the muscle cell will be multinucleate.
what happens after the mesodermal cells divide?
they lose the ability to divide.
what does the sarcoplasm contain?
