Flashcards in Chapter 1 - Muscular, Neuro and Cardio Systems Deck (53):
Bundles of Muscle Fibers
outer most layer of connective tissue that encloses the entire muscle
Tissue covering the outside of fiber bundles
connective tissue surrounding each muscle fiber
the cell membrane of a single muscle fiber
other name for motor end plate
a motor neuron and the muscle fibers it innervates
# of myosin molecules in a myosin filament
thin filaments of two strands in a double helix that interact with myosin
# of actin filaments that surround each myosin filament
# of of myosin filaments that surround each actin filament
The band that corresponds with the alignment of myosin filaments
band that contains the actin filaments
Area in the center of the sarcomere where only myosin filaments are present
tubules surrounding each myofibril
area in the middle of the i band that appears as a thin black line
in a stretched muscle, the I bands and h-zone _____________. and there is _______force potential due to the reduced cross bridge alignment
troponin is situated along ________ filaments
a protein that has a high affinity for calcium ions and is situated in intervals on the actin filaments is ________.
protein that runs along the actin filament in the groove of the double helix.
fusing of high frequency muscles twitches
position of body parts with respect to gravity
modified muscle fibers that are part of a muscle spindle that run parallel to the normal, or extrafusal fibers.
example of a muscle spindle test
knee jerk test
example of GTO reflex
reduced muscle size and strength
loss of function in older sedentary individuals is seen most prevalent in which muscles?
weight bearing extensors (lower limb and trunk extensors)
what area of the body does the right side of the heart pump blood?
through the lungs
what parts of the body does the left side of the heart pump blood to?
everywhere but the lungs.
each heart pump has two chambers _______and _______
atrium and ventricles
other name for the AV valves
tricuspid and mitral ( bicuspid) valves
ventricular contraction also known as________.
other name for the semilunar valves
aortic and pulmonary valve
role of semilunar valves
prevent backflow from aorta and pulm arteries into ventricles during relaxation.
role of the AV valves
prevent blood from flowing from ventricles into atria during contraction.
pacemaker of the heart
SA (sinoatrial node)
heart conduction order
left and right bundle branches
internodal pathways from SA node to AV
SA node > Internodal path > AV node > AV bundle > left and right branches
Subsections of each individual muscle fiber are also known as __________.
Subsections of each myofibril are called _________.
The smallest unit of measure of skeletal muscle anatomy is called a _______.
during contraction, the I-Bands and H-zone are _________.
The P-wave and QRS wave are all parts of the _______ phase.
The T-wave is symbolic of _________.
The size of these areas of the myofibril decrease during a contraction phase:
T-tubules run ________ in relation to the sarcoplasmic reticulum and terminate around the point of the _________.
The parasympathetic and sympathetic nervous systems are both part of the __________ nervous system.
autonomic nervous system
parasympathetic fiber stimulation results in a(n) __________ in heart rate.
sympathetic fiber stimulation results in a(n) __________ in heart rate.
arteries and arterioles carry blood _______ the heart
veins and venules carry blood _________ the heart
towards the heart