9A .1

Question 1

Are bones alone capable of moving

Answer 1

no they require muscles to apply force

Question 2

contraction

Answer 2

shortening and thickening

Question 3

relaxation

Answer 3

back to resting state

Question 4

40-50% of body weight comes from…

Answer 4

muscles

Question 5

strength

Answer 5

comes from the conversion of chemical energy (ATP) into mechanical energy to generate force, preform work, and produce movement

Question 6

Functions of muscle tissue (motion)

Answer 6

-skeletal muscles
-walking, running, talking, eating, shitting
-quick response to external environment changes (stimuli)

Question 7

Functions of muscle tissue (stabilize body positions)

Answer 7

-skeletal muscles
-function continuously, also stabilize and strengthen joints
- standing or sitting

Question 8

movement within the body and regulating organ volume

Answer 8

-smooth muscle and cardiac muscle
-contractions pump blood all throughout the body and regulate blood pressure
-aid in the movement of food throughout the GI tract
-hollow organs that store and release parts/liquids= sphincters, secretory organs

Question 9

Thermogenesis

Answer 9

-maintains normal body temp
-occurs in conjunction with contractions as they produce heat
-thought to produce as much as 85% of all body heat
-shivering= involuntary action that can increase thermogenesis by several hundred %

Question 10

skeletal muscle

Answer 10

-attached primarily to bones and moves the skeletal parts
- striated= visible altering light and dark bands of the fibers
*voluntary= muscle tissue is under your conscious control
-usually works with other tissues
-nervous
-connective

Question 11

Cardiac muscle

Answer 11

-forms majority of the heart
-has striations, branched fibers
-involuntary= out of your control, conscious or unconscious
*autorhythmicity= pacemaker system that causes heart to beat
- all fibers work in unison

Question 12

smooth muscle

Answer 12

-found in the walls of hollow internal structures
-location= blood vessels, organs of the GI tract
-dilate open/ constrict close
-not striated
-involuntary
has a form of autorhythmicity

Question 13

excitability (irritability)

Answer 13

-ability to respond to stimulus, internal or external, by producing electrical signals (+/ -)
- action potentials
-typically, the stimulus is a chemical
- neurotransmitter= chemical released by neurons
- hormone= chemical distributed by the bloodstream
-has to be passed by conduction (touch)

Question 14

contractility

Answer 14

• ability to shorten and thicken
• sets muscle apart from all other tissues

Question 15

extensibility

Answer 15

• the ability to be stretched without damage to the tissue
• can be stretched even farther than the resting length
  -most skeletal muscles are arranged in opposing pairs/groups
  -help resist movement of the contracting muscle
  
  • muscles always pull, NEVER push

Question 16

elasticity

Answer 16

• ability of a muscle fiber to recoil and resume its resting length after being stretched

Question 17

what are the 4 functions of muscle

Answer 17

• motion
• stabilize body positions
• movement within body regulating organ volume
• thermogenesis

Question 18

what tissues display “autorhythmicity”

Answer 18

• cardiac muscle
  smooth muscle