1
MCPHS ANATOMY & PHYSIOLOGY EXAM 2 EXAM
WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+
Functions of the muscular system: - ...(ANSWERS)....Movement of the body
Maintenance of posture
Respiration
Production of body heat
Communication
Constriction of organs and vessels
Contraction of heart
Three Es and a C: Properties of muscle tissue - ...(ANSWERS)....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 - ...(ANSWERS)....Skeletal - voluntary
Smooth - controlled involuntarily by endocrine and autonomic nervous system
Cardiac - controlled involuntarily by endocrine and autonomic nervous system
, 2
Epimysium - ...(ANSWERS)....CT that surrounds whole muscle
Perimysium - ...(ANSWERS)....loose CT surrounding a group of muscle fibers;
passage for blood vessels and nerves
Endomysium - ...(ANSWERS)....loose CT separating individual muscle fibers within
each fasicle
Fiber anatomy - ...(ANSWERS)....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 - ...(ANSWERS)....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
, 3
smooth. muscle - ...(ANSWERS)....Not striated, small fibers
Spindle-shaped, single, central nucleus
More actin than myosin, cross-bridging occurs
Ca2+ required to initiate contraction
Wavy
Sarcolemma - ...(ANSWERS)....plasma membrane, surround sarcoplasm
(cytoplasm)
Transverse tubules (T tubules) - ...(ANSWERS)....inward folds of sarcolemma;
project into interior of muscles
Sarcoplasmic reticulum - ...(ANSWERS)....specialized smooth ER; store calcium
terminal cisternae - ...(ANSWERS)....Enlarged portion od SR adjacent to T tubules
Myofibrils - ...(ANSWERS)....protein filament bundles; contain myofilaments that
cause contraction
Myofilament - ...(ANSWERS)....actin and myosin
Actin - ...(ANSWERS)....thin
MCPHS ANATOMY & PHYSIOLOGY EXAM 2 EXAM
WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+
Functions of the muscular system: - ...(ANSWERS)....Movement of the body
Maintenance of posture
Respiration
Production of body heat
Communication
Constriction of organs and vessels
Contraction of heart
Three Es and a C: Properties of muscle tissue - ...(ANSWERS)....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 - ...(ANSWERS)....Skeletal - voluntary
Smooth - controlled involuntarily by endocrine and autonomic nervous system
Cardiac - controlled involuntarily by endocrine and autonomic nervous system
, 2
Epimysium - ...(ANSWERS)....CT that surrounds whole muscle
Perimysium - ...(ANSWERS)....loose CT surrounding a group of muscle fibers;
passage for blood vessels and nerves
Endomysium - ...(ANSWERS)....loose CT separating individual muscle fibers within
each fasicle
Fiber anatomy - ...(ANSWERS)....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 - ...(ANSWERS)....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
, 3
smooth. muscle - ...(ANSWERS)....Not striated, small fibers
Spindle-shaped, single, central nucleus
More actin than myosin, cross-bridging occurs
Ca2+ required to initiate contraction
Wavy
Sarcolemma - ...(ANSWERS)....plasma membrane, surround sarcoplasm
(cytoplasm)
Transverse tubules (T tubules) - ...(ANSWERS)....inward folds of sarcolemma;
project into interior of muscles
Sarcoplasmic reticulum - ...(ANSWERS)....specialized smooth ER; store calcium
terminal cisternae - ...(ANSWERS)....Enlarged portion od SR adjacent to T tubules
Myofibrils - ...(ANSWERS)....protein filament bundles; contain myofilaments that
cause contraction
Myofilament - ...(ANSWERS)....actin and myosin
Actin - ...(ANSWERS)....thin
