Recap of Skeletal, Smooth, and Cardiac Muscles Flashcards
1
Q
Similarities across all three:
A
- excitable tissue w/ RMP
- respond to stimulation by increasing intracellular Ca2+, which leads to contraction
- contract by sliding actin past myosin
- have length-tension relationship
2
Q
RMP for all are established by…
A
- Na+/K+ ATPase pump
- leaky K+ channels
3
Q
Speed of contraction is slower in…
A
smooth muscles
4
Q
Speed of contraction is faster in…
A
skeletal and cardiac muscles
5
Q
T/F: length in skeletal muscle is limited by its attachment to muscle
A
T
6
Q
Skeletal muscle functions best at…
A
specific optimal lengths
7
Q
Cardiac muscle usually functions at…
A
suboptimal lengths
8
Q
Smooth muscles can function over…
A
very wide ranges
9
Q
The three types differ in…
A
- organization
- location
- innervation
10
Q
How are the organizations of the three muscles different?
A
- skeletal and cardiac are actin linked
- smooth is myosin linked
- smooth also has no striations
11
Q
How are the locations of the three muscles different?
A
- skeletal are between bones
- cardiac is in the heart
- smooth is in visceral organs, blood vessels, and sensory organs
12
Q
How are the innervations different?
A
- skeletal is innervated by somatic nervous system (voluntary)
- cardiac and smooth are innervated by autonomic system (involuntary): don’t need innervation to contract
13
Q
How is the duration of AP different?
A
- short in skeletal
- long in cardiac
- longest in smooth
