BIOL 2220 unit 3 Exam Questions Correct Verified Answers New Update (A+ Pass)
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BIOL 2220
Institution
BIOL 2220
BIOL 2220 unit 3 Exam Questions Correct Verified Answers New Update (A+ Pass)
What are the classifications of muscle - Answers - 1. striations 2. voluntary or involuntary 3. # of nuclei
types of muscle - Answers - smooth, cardiac, skeletal
smooth muscle - Answers - no striations or discs, ...
BIOL 2220 unit 3 Exam Questions
Correct Verified Answers New
Update (A+ Pass)
What are the classifications of muscle - Answers -✔✔ 1. striations 2. voluntary or
involuntary 3. # of nuclei
types of muscle - Answers -✔✔ smooth, cardiac, skeletal
smooth muscle - Answers -✔✔ no striations or discs, uninucleate, involuntary
cardiac muscle - Answers -✔✔ striations and discs, involuntary, uninucleate, found in
heart
skeletal muscle - Answers -✔✔ striations (no discs), multinucleate, voluntary
properties of ALL muscles - Answers -✔✔ excitability, contractility, extensibility,
elasticity
excitability - Answers -✔✔ ability to respond to stimuli
Contractility - Answers -✔✔ ability to shorten forcibly when stimulated
Extensibility - Answers -✔✔ ability to be stretched and extended past normal
Elasticity - Answers -✔✔ The ability of a material to bounce back after being disturbed
stimulus is - Answers -✔✔ normal a nervous impulse
Skeletal muscles work in - Answers -✔✔ antagonistic pairs
example of antagonistic pairs - Answers -✔✔ biceps and triceps: biceps contract while
triceps extend
Functions of Muscle - Answers -✔✔ movement, maintenance of posture, production of
heat, stabilization of joints
maintenance of posture - Answers -✔✔ Contraction of skeletal muscle keeps us
upright to fight the downward pull of gravity- ex when food comes back up or bloodflow
up
, stabilization of joints - Answers -✔✔ muscle tone of joints helps to stabilize
muscle tone - Answers -✔✔ the state of balanced muscle tension that makes normal
posture, coordination, and movement possible- always present
heat production - Answers -✔✔ byproduct of contraction; example: shivering
example: muscle causing hair to stand up - Answers -✔✔ arrector pili
shivering is the _______ - Answers -✔✔ rapid contraction of skeletal muscle
is a muscle an organ? why or why not - Answers -✔✔ yes; an organ is 2+ tissues for
purpose
components of skeletal muscle - Answers -✔✔ skeletal muscle fiber (muscle tissue that
is classified by the three criteria used to classify muscles), blood vessels, nerve fibers,
connective tissue
skeletal muscle (gross anatomy) - Answers -✔✔ can see with naked eye, 100s-1000s
of individual muscle cells, contains blood vessels, fibers, and connective tissue
attatchment - Answers -✔✔ thing that connects muscle to bone; typically a tendon;
dense irregular CT, extension of periosteum
tendon - Answers -✔✔ type of indirect muscle attatchment, when CT wrapper of
muscle extends like a ropeto attatch to bone
Epimysium - Answers -✔✔ The connective tissue extension from the tendon that
surrounds the whole muscle
Basically an extension of the periosteum
Made of dense irregular connective tissue
Fascicle - Answers -✔✔ bundle of muscle fibers
Perimysium - Answers -✔✔ dense irregular tissue that that covers/surrounds fascicle
muscle fiber - Answers -✔✔ Also called the muscle cell
Also called a myofiber
These are the individual muscle cells that make up the muscle
Endomysium - Answers -✔✔ The reticular CT that covers the muscle fiber
The mesh that reticular connective tissue forms into can move during contraction that
dense irregular connective tissue would not be able to do
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