CANFITPRO CHPT 6- Muscular Anatomy Exam
Questions And Answers (Verified And
Updated)
4 characteristics of muscle tissue
excitability, contractility, extensibility, elasticity
3 types of muscle tissue
skeletal, cardiac, smooth
functions of muscle tissue
Skeletal muscle: connects to the skeletal system by being attached to 2 bones
Cardiac muscle: interconnected so when one cell contracts, all contracts
Smooth muscle: found in organs of digestive, urinary and circulatory system. Works collectively or
independently
How many skeletal muscles are in the body?
over 600
Skeletal muscle function
movement, maintain upright posture, and generate heat to maintain body temperature
Muscle cells are primarily ______ water
Well organized set of proteins _____
73 % water
24% proteins
Muscle fibers
thousands of elongated, rod shaped cells
Fascicle
held together by connective tissue layer called perimysium
Each muscle fiber is surrounded by a thin elastic membrane called ______ that encloses the contents
of fiber
sacrolemma
2 types of proteins in sacromere
thin filament: actin
Thick filament: myosin
Types of muscle contractions
concentric: shortens
eccentric: lengthens
isometric: no change in muscle length
, Skeletal muscle contractions is controlled by ________
Nervous System
CNS (central nervous system)
consists of the brain and spinal cord
It's the control centre of nervous system as it receives information from PNS and develops
appropriate response
PNS (peripheral nervous system)
made up of nerves that connect the extremities to the CNS. Continuously delivers info about all body
part to the brain to process
sensory neurons (afferent)
Carry information and sensation from the body and environment to the CNS
motor neurons (efferent)
carry information from the CNS back to the muscles to create a response or movement
Proprioceptors
- specialized sensory receptors found in joints, muscles and tendons.
- Sensitive to pressure and tension
- responsible for sending messages to CNS to maintain muscle tone and perform coordinated
movements
Muscle spindles
type of proprioceptors that consists of several modified muscle fibers
GTO (golgi tendon organ)
only activated when muscle contracts
slow twitch muscle fibers
- perform slow and controlled muscle contractions
-contracts slow, resistant to fatigue, work aerobically
- better for long endurance activity (marathon)
fast twitch muscle fibers
- Quick, high-intensity contractions
- contract faster, fatigue faster, work anaerobically
- e.g. sprinters
force that a muscle can generate
muscle size
A muscle has potential to generate its greatest force when it is at its resting length
muscle length
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