Muscular System Flashcards
3 types of muscle tissue
skeletal, cardiac, smooth
skeletal muscle function
moves bones, generate heat
Cells in skeletal muscle are called ______
myocytes
Reddish pigment inside myocytes are called ____
myoglobin
Which muscles have striations?
skeletal, cardiac
Smooth muscle is less/more organized than skeletal or cardiac muscle
less organized
Smooth muscle cells
1 nucleus, no striations, found in digestive, reproductive, urinary systems, blood vessels
Fascia
connective tissue which is on the most outer layer of skeletal muscle along length of the muscle, connecting to tendons
The point where the motor neuron connects to a skeletal muscle is called _______
motor end plate
Sensory neurons carry information ______ the brain
towards (the brain and spinal cord)
what does an action potential in the motor neuron lead to?
influx of calcium into axon terminal
what is released from the axon terminal once calcium enters?
acetylcholine is released
During muscle contraction, where does the neurotransmitter that is released from the axon terminal go and what does it do?
acetylcholine moves across synaptic cleft from axon terminal to motor end plate; acetylcholine promotes opening of sodium channels at motor end plate, sodium rushes into skeletal muscle cell, leading to depolarization of skeletal muscle
what happens when skeletal muscle goes from polarized to depolarized?
sarcoplasmic reticulum will release calcium in order to make muscles polar??? why?
muscle contraction occurs when _____ contracts, and this happens when
sarcomere; actin and myosin overlap
