Muscle Tissue Flashcards
can shorten with force and pull on attachment points
contractility
can stretch or extend
extensibility
can generate electricity
excitability
can recoil back to original position
elasticity
The functional unit of skeletal muscle is called a
sarcomere
Human muscles are powered by _____________, which is generated in the body through _______________.
ATP; cellular respiration
______________ muscle is a voluntary muscle that usually connects two bones, _____________ muscle is an involuntary, fatigue-resistant muscle found exclusively in the heart, and ______________ muscle is an involuntary muscle found in viscera (internal organs).
skeletal; cardiac; smooth
Which of the following is NOT a function of muscles in the human body?
movement
posture
balance
generating heat
all of the above are functions of muscles in the human body
In order for actin and myosin to be able to carry out their function, ______________ must first rush into the cell to remove the molecule that normally blocks them from grabbing and sliding across each other.
calcium
The specific neurotransmitter that sends the signal from a motor neuron to muscles is
acetylcholine
The generic name for a protein that transmits a neuron’s signal from one neuron to another, or from a neuron to a muscle fiber (muscle cell) is called
a neurotransmitter
The ion that depolarizes (flips the electric charge) of a muscle cell is _____, and the ion that repolarizes (resets the electric charge) is _____.
Na+; K+
A bundle of muscle fibers (muscle cells) is called a ________________.
fascicle
The neurons that carry the signals from the brain to effectors, such as muscles, to carry out their effects, such as movement, are called ______________
motor neurons
The site at which the nerve and muscle come together is called the
neuromuscular junction