1. every human body has an uncountable number of this basic unit of a muscle known as the: (1 point)
a) muscle fibers
b) ligaments
c) tendons
d) muscle tissues
2. slow-twitch muscles are needed for: (1 point)
a) quick, short bursts of energy for high intensity
b) endurance activities
c) speed or power activities
d) low endurance and short duration exercises
3. a group of muscle fibers responsible for a specific movement is called: (1 point)
a) a motor unit
b) a striated group
c) a fast-twitch unit
d) a slow-twitch unit
4. when a muscle fiber contracts as much as it can it is called the (1 point)
a) maximum potential principal
b) contraction principal
c) muscular capacity principal
d) all or none principal
5. select the answer below that best fits the following description.
voluntary
come in pairs
attach to the bones through tendons
made up of long, cylindrical fibers (1 point)
a) striated muscles
b) cardiac muscles
c) smooth muscles
d) contracted muscles
6. select the answer below that best fits the following description.

involuntary
found in internal organs
can stretch or maintain tension for long periods of time

(1 point)
a) striated muscles
b) cardiac muscles
c) smooth muscles
d) skeletal muscles
7. select the answer below that best fits the following description.
involuntary
only found in the heart
(1 point)
a) striated muscles
b) cardiac muscles
c) smooth muscles
d) skeletal muscles