Day 1 Flashcards
(41 cards)
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
