MCPHS ANATOMY AND PHYSIOLOGY
EXAM 3 EXAMPREP COMPREHENSIVE
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
⩥ Three Es and a C: Properties of muscle tissue.
Answer: Contractility - ability of a muscle to shorten with force
Excitability - capacity of a muscle to respond to a stimulus
Extensibility - muscle can stretch beyond normal resting length and be
able to contract
Elasticity - ability of muscle to recoil to original resting length after
stretched
⩥ 3 types of muscle.
Answer: Skeletal - voluntary
Smooth - controlled involuntarily by endocrine and autonomic nervous
system
Cardiac - controlled involuntarily by endocrine and autonomic nervous
system
⩥ Epimysium.
Answer: CT that surrounds whole muscle
,⩥ Perimysium.
Answer: loose CT surrounding a group of muscle fibers; passage for
blood vessels and nerves
⩥ Endomysium.
Answer: loose CT separating individual muscle fibers within each
fasicle
⩥ Fiber anatomy.
Answer: Large, multinucleated
1-4 mm avg length
Have striated appearance
Number of fibers is relatively constant after birth
- Get larger, but not more
⩥ cardiac muscle.
Answer: Only in heart
Striated
Each cell has 1 nucleus
Intercalated disks and gap junctions
Autorhythmic
, Action potentials of longer curation and refractory period
Ca2+ regulated contraction
⩥ smooth. muscle.
Answer: Not striated, small fibers
Spindle-shaped, single, central nucleus
More actin than myosin, cross-bridging occurs
Ca2+ required to initiate contraction
Wavy
⩥ Sarcolemma.
Answer: plasma membrane, surround sarcoplasm (cytoplasm)
⩥ Transverse tubules (T tubules).
Answer: inward folds of sarcolemma; project into interior of muscles
⩥ Sarcoplasmic reticulum.
Answer: specialized smooth ER; store calcium
⩥ terminal cisternae.
Answer: Enlarged portion od SR adjacent to T tubules
EXAM 3 EXAMPREP COMPREHENSIVE
QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
⩥ Three Es and a C: Properties of muscle tissue.
Answer: Contractility - ability of a muscle to shorten with force
Excitability - capacity of a muscle to respond to a stimulus
Extensibility - muscle can stretch beyond normal resting length and be
able to contract
Elasticity - ability of muscle to recoil to original resting length after
stretched
⩥ 3 types of muscle.
Answer: Skeletal - voluntary
Smooth - controlled involuntarily by endocrine and autonomic nervous
system
Cardiac - controlled involuntarily by endocrine and autonomic nervous
system
⩥ Epimysium.
Answer: CT that surrounds whole muscle
,⩥ Perimysium.
Answer: loose CT surrounding a group of muscle fibers; passage for
blood vessels and nerves
⩥ Endomysium.
Answer: loose CT separating individual muscle fibers within each
fasicle
⩥ Fiber anatomy.
Answer: Large, multinucleated
1-4 mm avg length
Have striated appearance
Number of fibers is relatively constant after birth
- Get larger, but not more
⩥ cardiac muscle.
Answer: Only in heart
Striated
Each cell has 1 nucleus
Intercalated disks and gap junctions
Autorhythmic
, Action potentials of longer curation and refractory period
Ca2+ regulated contraction
⩥ smooth. muscle.
Answer: Not striated, small fibers
Spindle-shaped, single, central nucleus
More actin than myosin, cross-bridging occurs
Ca2+ required to initiate contraction
Wavy
⩥ Sarcolemma.
Answer: plasma membrane, surround sarcoplasm (cytoplasm)
⩥ Transverse tubules (T tubules).
Answer: inward folds of sarcolemma; project into interior of muscles
⩥ Sarcoplasmic reticulum.
Answer: specialized smooth ER; store calcium
⩥ terminal cisternae.
Answer: Enlarged portion od SR adjacent to T tubules
