Aerobic respiration occurs in the…
mitochondria
Dark turkey meat is dark because it contains more…
myoglobin
More powerful muscle contractions can be produced by…
more action potentials
Small motor units are…
more precise
Fast twitch muscle cells have more [ ] than do slow twitch cells
glycogen
Does anaerobic respiration produce energy faster than aerobic respiration?
Yes, anaerobic respiration Produces energy faster than aerobic respiration
A single motor neuron and all the muscle fibers it innervates is called a…
motor unit
The troponin-tropomyosin complex prevents…
prevents myosin heads from binding to actin
Calcium ions bind too…
bind to the troponin-tropomyosin complex
Is ATP a neurotransmitter?
no
What gets shorter during muscle contraction?
sarcomeres
Is acetylcholine a neurotransmitter?
yes
The molecule which actively pumps Ca++ back into the sarcoplasmic reticulum is…
calsequestrin
A depolarization strong enough to cause an action potential is called a…
threshold stimulus
Is myosin ATPase an enzyme?
yes (hint: ends in -ase)
Slow twitch muscle cells have more [ ] than fast twitch cells
Mitochondria and Capillaries
What is the best description of a sarcomere?
a segment of myofibril
Thick filaments contain which protein?
myosin
What prevents myosin from binding to actin?
troponin-tropomyosin complex
The sarcoplasmic reticulum contains…
Ca++
The function of ATP within a muscle cell is to…
-Fuel the active transport of Ca++ into the sarcoplasmic reticulum
-Release myosin heads from actin after they have flexed
Increasing the number of action potentials sent down an axon will…
recruit increasing numbers of myofibrils within the motor unit
The all-or-none principle means that…
If a muscle fiber contracts, it always contracts completely
The function of Ca++ within a muscle cell is to…
bind to the troponin-tropomyosin complex, exposing actin binding sites
Acetylcholine
-is the neurotransmitter found at the neuromuscular junction
-is broken down by acetylcholinesterase
-binds to receptor sites on the motor end plate
At the neuromuscular junction…
I don’t know the answer it’s one of these
A. The axon terminals contain receptor sites for neurotransmitter
B. The sarcolemma contains vesicles full of neurotransmitter
C. The axon terminal is separated from the sarcolemma by the synaptic cleft
D. None of these
E. A and C, but not B
Which of the following is NOT a function of the muscular system?
Hematopoiesis
What type of muscle is striated and involuntary?
Cardiac
An action potential occurs when…
enough sodium enters a cell to open voltage regulated gates from the inside