Shared Flashcard Set

Details

Anatomy and Physiology II: Unit 2 Muscle Physiology
N/A
46
Anatomy
11th Grade
04/28/2015

Additional Anatomy Flashcards

 


 

Cards

Term
acetylcholine receptor
Definition
ligand gated channel on the muscle cell through which acetylcholine flows
Term
actin filament
Definition
acts with myosin filaments in order to make the muscle contract and release
Term
action potential
Definition
nerve impulse that causes the potential of the cell to rapidly rise and fall
Term
aerobic metabolism
Definition
oxygen using metabolism, ATP comes from carbohydrates, fatty acids, and amino acids
Term
anaerobic metabolism
Definition
non-oxygen using metabolism in which ATP comes from the combustion of carbohydrates in the absence of oxygen
Term
ATP
Definition
energy needed for muscle contraction, adentasin triphosphate
Term
Ca2+ pump
Definition
pump calcium ions into and out of the sarcoplasmic reticulum
Term
contraction phase
Definition
cross bridge is active, lasts until the peak of tension, 10-100ms
Term
creatine phosphate
Definition
fuel source for type 2a and 2b muscle fibers
Term
crossbridge
Definition
the attachment site when myosin and actin are working together
Term
depolarization
Definition
when the voltage of the motor neuron becomes less negative
Term
electrochemical gradient
Definition
different electrical potential and chemical concentration
Term
fascicle
Definition
bundle of muscle fibers within the muscle
Term
glycogen
Definition
serves as a form of energy storage
Term
glycolysis
Definition
when glucose is converted into pyruvic acid and energy is released in the form of ATP.
Term
hyperpolarization
Definition
when the voltage of the motor neuron becomes extremely negative
Term
K+ leaky channel
Definition
potassium channels that are always open, allow potassium ions to continuously flow through
Term
lactic acid
Definition
byproduct of exercise, causes muscle fatigue and soreness
Term
latent phase
Definition
first few seconds following stimulation, muscle tension begins to increase, contraction coupling is occurring
Term
ligand-gated Na+ channels
Definition
gated sodium channels that open when activated by neurotransmitters, allow sodium ions to flow through
Term
mitochondria
Definition
creator of ATP energy, powerhouse of the cell
Term
motor unit
Definition
motor neuron and all the muscle fibers it supplies
Term
muscle fiber
Definition
tubes spread throughout the muscle
Term
muscle twitch
Definition
response of a motor unit to an action potential of its motor neuron, muscle fiber quickly contracts and then releases
Term
myofibril
Definition
tubes within the muscle fibers
Term
myofilament
Definition
chains of myosin and actin, make up the myofibrils
Term
myosin filament
Definition
acts with actin in order to make the muscle contract
Term
myosin head
Definition
part of myosin that acts with actin
Term
Na+ leaky channel
Definition
Sodium channel that is always open, continuously allows sodium ions to flow through
Term
Na+/K+ pump
Definition
pump sodium and potassium ions into and out of the neuron
Term
neuromuscular junction
Definition
synaptic cleft between the neuron and the muscle
Term
oxygen debt
Definition
extra oxygen that must be taken into the body to restore all systems to their normal states after exercise
Term
relaxation phase
Definition
initiated by reentry of Ca2+ into the sarcoplasmic reticulum, muscle tension returns to baseline, if muscle was shortened in contraction phase it returns to its original length
Term
repolarization
Definition
when the voltage of the motor neuron becomes more positive
Term
resting potential
Definition
the potential of the neuron in its resting state, -70mV
Term
sacromere
Definition
contractile unit of a myofibril, contains parallel actin and myosin filaments
Term
sacroplasmic reticulum
Definition
within the muscle cell, calcium ions are pumped into it
Term
sarcolemma
Definition
membrane on the muscle cell in which the T tubule is located
Term
t-tubule
Definition
tube in the sarcolemma through which the acetylcholine flows
Term
tropomyosin
Definition
blocks myosin and actin from interacting
Term
troponin
Definition
pushes the tropomyosin out of the way so that myosin and actin may interact
Term
type 1 muscle fiber
Definition
aerobic muscle fiber, uses triglycerides for fuel, extended motion
Term
type 2a muscle fiber
Definition
anaerobic muscle fiber, uses creatine phosphates and glycogen for fuel, rapid motion
Term
type 2b muscle fiber
Definition
anaerobic muscle fiber, uses creatine phosphates and glycogen for fuel, very rapid motion
Term
voltage-gated K+ channels
Definition
potassium channels that only open once the motor neuron has reached a certain voltage
Term
voltage-gated Na+ channels
Definition
sodium channels that only open once the motor neuron has reached a certain voltage
Supporting users have an ad free experience!