Muscles Flashcards
The contracting proteins within a muscle fiber
myosin and actin
When a muscle contracts it:
shortens and pulls a bone
Muscles are attached to bone by:
tendons
Some oxygen may be stored within the muscle fibers bonded to the protein
myoglobin
An antagonist to a muscle that flexes the arm would be a muscle that:
extends the arm
The axon terminal of a motor neuron releases:
acetylcholine
Acetylcholine makes the sarcolemma more permeable to:
sodium ions
The most abundant source of energy in a muscle fiber is:
glycogen
The part of the brain that coordinates voluntary movement is the:
cerebellum
The neuromuscular junction refers to the:
axon terminal, synapse, and sarcolemma
Unconscious muscle sense is integrated by the:
cerebellum, and we are unaware of it
The move moveable attachment of a muscle to a bone is called the:
insertion
Good muscle tone is important because:
maintain posture and produce body heat
Muscle fatigue is the result of the lack of ___ and the production of ___
- oxygen
2. lactic acid
The specific part of the brain that initiates muscle contraction is the:
fontal lobe
During exercise, the blood flow within a muscle is increased by:
vasoldilation
The product of cell respiration that is considered a waste product is:
carbon dioxide
The organ system that transports oxygen to muscles and removes carbon dioxide is the:
circulatory system
The energy of ATP is released within the muscle fibers by:
myosin
In response to a nerve impulse, the electrical changes on the sarcolemma are reversed. This is called:
depolarization
Synergistic muscles are those that have the same:
function
An isometric contraction is one:
without movement
The inhibiting proteins within a muscle fibers are:
troponin and tropomyosin
A nitrogenous waste product of muscle contraction is ___, which is excreted by the ____.
- creatinine
2. kidneys
The mineral released within sarcomeres to trigger contraction is:
potassium
