Day 1 Flashcards
Skeletal muscle tissue is packed into what?
Skeletal muscles
What does skeletal muscle tissue do?
They attach and cover the skeleton
Who has the longest muscle cells?
Skeletal muscle fibers
Skeletal muscle fibers have obvious stripes called what?
Striations
What is skeletal muscle also called?
Voluntary muscle
Why is the skeletal muscle called the voluntary muscle?
Because it is the only type subject to conscious motion
What is skeletal muscle responsible for?
Overall, body mobility, can’t contract rapidly, tires, easily, but can exert tremendous power.
What are the keywords to remember for skeletal muscle?
Skeletal, striated, and voluntary.
Cardiac muscle tissue only occurs in what?
In the heart
Cardiac muscle tissue constitutes the bulk of what?
The bulk of the heart walls
Are cardiac muscle cells striated?
Yes
Is cardiac muscle Voluntary or involuntary?
Involuntary
Cardiac muscle usually contracts at a fairly steady rate set by what?
The heart’s pacemaker
Neural controls in the cardiac muscle allow the heart to do what?
Allow the heart to speed up for brief periods
What are the keywords to remember for cardiac muscle?
Cardiac, striated, involuntary.
Where is smooth muscle tissue found in?
It is found in the walls of hollow visceral organs.
Name three visceral organs
The stomach, the urinary bladder, respiratory passages
What is the smooth muscles role?
Their role is to force, fluids and other substances through internal body channels
Smooth muscle has no what and is not subject to what?
Has no striations and is not subject to voluntary control
Describe smooth muscle contractions
They are slow and sustained
What are the keywords for smooth muscle tissue?
Visceral, non-striated, involuntary
What is extensibility?
It is the ability of a cell to receive and respond to a stimulus by changing its membrane potential
In muscle, the stimulus is usually a chemical, such as what
A neurotransmitter released by a nerve cell
What is extensibility?
It is the ability to extend or stretch
What happens to muscle cells when they are contracted?
The muscle cells are shortened
What happens when the muscle cells are relaxed?
They can be stretched even beyond their resting length
What is contractillity?
It is the ability to shorten forcibly when adequately stimulated
What is elasticity?
It is the ability of a muscle cell to recoil and resume its resting length after stretching
Skeletal muscles are responsible for what?
For all locomotion and manipulation
Muscles strengthen and stabilize what?
The joints of the skeleton
What do muscles generate as they contract?
They generate heat
Muscles generating heat place a role in maintaining what?
Normal body temperature
What is skeletal muscle made up of?
Muscle fibers, nurse, blood vessels, connective tissues
What is the role of the connective tissue?
It supports each cell and reinforce and hold together the muscle
What is the epimysium?
It is an overcoat, dense irregular connective tissue that surrounds the muscle
What is the perimysium?
It’s surrounds each fascicle
What is a facile?
It is a bundle of muscle fibers
What is the endomysium?
It is a sheet of connective tissue that surrounds each muscle fiber
The connective tissue sheets are continuous with who?T
They are continuous with one another, and with the tendons that joined muscles to bone
What does it mean when the muscle attachments are direct?
The epimysium is fused to the periosteum of a bone
Each scout to muscle fiber is made up of what?
A long cylindrical cell with multiple oval nuclei
