lsu kin 2504 (sontag): exam 2 UPDATED ACTUAL Questions And Correct
Answers
C
Terms in this set (268)
skeletal system 206 bones in the adult body; provides leverage, support and protection, and
pulled on muscles to allow the body to push or pull against external objects
joint junction of bone
cartilaginous joint allow limited movement (intervertebral)
fibrous joint allow virtually no movement (sutures of the skull)
synovial joint (ball and socket) allow considerable movement (elbows and knees)
uniaxial joint operate as a hinge and rotate about one axis
biaxial operate in two perpendicular axes (ankles and wrist)
multiaxial allow movement in all 3 axes (shoulder and hip)
vertebral column vertebral bones separated by flexible disks that allow movement
cervical vertebrae neck region; 7
thoracic vertebrae upper back; 12
lumbar vertebrae lower back; 5
sacral vertebrae make up rear of pelvis; 5
coccygeal vertebrae form vestigial tail extending down from teh pelvis; 3-5
ligament a tough band of tissue that connects the ends of bones to other bones or
supports organs in place; made out of connective tissue that has a lot of strong
collagen fibers in it
cartilage tough, resilient tissue that acts as a cushion between the bones in a joint
tendon tough fibrous structure that connects muscles to bones; transmits muscle forces
to bones and joints
the major difference between life span and health span freedom from chronic/disabling disease
is...
, muscles make up 40% of an avg persons body mass; move the body and enable force
production; when contracted, it moves bone by pulling on the tendon that
attachebomes the muscle to the
macrostructure each skeletal muscle is an organ that contains muscle tissue connective tissue,
nerves, and blood vessels
microstructure fibrous connective tissue, or epimysium, covers the body's more than 430 skeletal
muscles
muscle fiber a single muscle cell, usually classified according to strength, speed of
contraction, and energy source
myofibrils protein structures that make up the muscle fibers
nuclei cell structures containing DNA and genes that direct the production of proteins
satellite cells strength training activates _ that provide additional muscle cell nuclei
hypertrophy increase in size of muscle fibers
atrophy decrease in size of muscle fibers
hyperplasia increase in number of muscle fibers
slow twitch fibers red; fatigue resistant, slow contraction speed, lower capacity for tension;
recruited for endurance activities; type 1
fast twitch fibers white; contract rapidly, fatigue quickly; recruited for actions requiring strength,
power, and speed; type 2A or 12
power the rate at which work is done; the ability to exert force rapidly
even all people have an _ mix of fast and slow twitch fibers
the number of muscle fibers within each motor unit the extent of control of a muscle depends on...
as few as one muscle fiber per motor neuron muscles that require precision may have...
several hundred fibers served by one motor neuron muscles that may not require precision have..
motor unit a motor neuron and all the muscle cells it stimulates
less than 10 muscle fibers intricate, precision
more than 100 muscle fibers forceful, powerful
Answers
C
Terms in this set (268)
skeletal system 206 bones in the adult body; provides leverage, support and protection, and
pulled on muscles to allow the body to push or pull against external objects
joint junction of bone
cartilaginous joint allow limited movement (intervertebral)
fibrous joint allow virtually no movement (sutures of the skull)
synovial joint (ball and socket) allow considerable movement (elbows and knees)
uniaxial joint operate as a hinge and rotate about one axis
biaxial operate in two perpendicular axes (ankles and wrist)
multiaxial allow movement in all 3 axes (shoulder and hip)
vertebral column vertebral bones separated by flexible disks that allow movement
cervical vertebrae neck region; 7
thoracic vertebrae upper back; 12
lumbar vertebrae lower back; 5
sacral vertebrae make up rear of pelvis; 5
coccygeal vertebrae form vestigial tail extending down from teh pelvis; 3-5
ligament a tough band of tissue that connects the ends of bones to other bones or
supports organs in place; made out of connective tissue that has a lot of strong
collagen fibers in it
cartilage tough, resilient tissue that acts as a cushion between the bones in a joint
tendon tough fibrous structure that connects muscles to bones; transmits muscle forces
to bones and joints
the major difference between life span and health span freedom from chronic/disabling disease
is...
, muscles make up 40% of an avg persons body mass; move the body and enable force
production; when contracted, it moves bone by pulling on the tendon that
attachebomes the muscle to the
macrostructure each skeletal muscle is an organ that contains muscle tissue connective tissue,
nerves, and blood vessels
microstructure fibrous connective tissue, or epimysium, covers the body's more than 430 skeletal
muscles
muscle fiber a single muscle cell, usually classified according to strength, speed of
contraction, and energy source
myofibrils protein structures that make up the muscle fibers
nuclei cell structures containing DNA and genes that direct the production of proteins
satellite cells strength training activates _ that provide additional muscle cell nuclei
hypertrophy increase in size of muscle fibers
atrophy decrease in size of muscle fibers
hyperplasia increase in number of muscle fibers
slow twitch fibers red; fatigue resistant, slow contraction speed, lower capacity for tension;
recruited for endurance activities; type 1
fast twitch fibers white; contract rapidly, fatigue quickly; recruited for actions requiring strength,
power, and speed; type 2A or 12
power the rate at which work is done; the ability to exert force rapidly
even all people have an _ mix of fast and slow twitch fibers
the number of muscle fibers within each motor unit the extent of control of a muscle depends on...
as few as one muscle fiber per motor neuron muscles that require precision may have...
several hundred fibers served by one motor neuron muscles that may not require precision have..
motor unit a motor neuron and all the muscle cells it stimulates
less than 10 muscle fibers intricate, precision
more than 100 muscle fibers forceful, powerful
