Unit 4: Notes 1 Flashcards
name the functions of muscle
- produce body movement
- stabilize body position
- regulate body volume
- move substances internally (involuntary)
- produce heat
- help maintain homeostasis
what are the physiological properties?
- elasticity
- contractibility
- excitability
- extensibility
elasticity
ability to stretch and go back to normal shape
contractability
ability to shorten
excitability
ability to respond to stimuli
extensibility
ability to stretch without tearing
what are the common characteristics
- all muscle fibers are elongated
2. have two types of muscle filaments for contraction (actin and myosin)
name the three types of muscle
skeletal, smooth, cardiac
what is the general info of skeletal muscle
- 40%-50% of total body weight
- controlled: consciously (voluntary)
- aka voluntary muscle
where is skeletal muscle found
attached to the bones
. what does skeletal muscle look like
- thick
- long
- cylindrical
- unbranched
- striated
- multi-nucleated
what are the functions of skeletal muscle
- moving the skeleton
- maintaining posture
- stabilizing joints
- generates heat
is smooth muscle voluntary or involuntary
involuntary
where is smooth muscle found
found in the walls of hollow organs in the walls of blood vessels
what does the fibers of smooth muscle look like
- relatively small
- non-striated
- spindle shaped
- one nucleus/cell
function of smooth muscle
internal movement
is cardiac muscle voluntary or involuntary
involuntary
where is cardiac muscle found
in the walls of the heart
what do the fibers of cardiac muscle look like
- short
- branching
- cylindrical
- finely striated
- contain one nucleus per cell
- intercalated discs
what are intecalated discs
joints between cells
what is the function of cardiac muscle
pump blood
