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WorksheetsHow are myofilaments arranged?
Total questions: 13
Worksheet time: 7mins
Actin and myosin filaments work together to produce a muscle contraction. They are attached to each other at a ________.
Z-line
M-line
A-band
H-zone
The space between two Z-lines is called the ________.
sarcomere
myofibril
actin filament
H-zone
The actin & myosin interact to pull the muscle fiber towards the ________, shortening the muscle fiber.
M-line
Z-line
A-band
I-band
What initiates muscle fiber contraction?
Nerve impulses
Blood flow
Hormone release
Oxygen absorption
What do myosin heads attach to during muscle contraction?
Actin filaments
Sarcomere
Z-lines
ATP
What happens to the sarcomere during muscle contraction?
It gets shorter
It gets longer
It stays the same length
It disappears
What is the name of the theory that explains muscle contraction?
Sliding filament theory
Muscle shortening theory
ATP contraction theory
Nerve impulse theory
What molecule provides the energy for muscle contraction?
ATP
Glucose
DNA
Oxygen
What molecule binds to troponin to initiate the contraction process?
ATP
Ca2+
ADP
Myosin
Fill in the blank: ________ is when ATP is no longer efficiently being used for cross-bridges.
Muscle Fatigue
Muscle Contraction
Muscle Relaxation
Muscle Growth
Fill in the blank: ________ is when muscles begin to burn, causing you to stop exercising before cells are injured.
Anaerobic Respiration
Aerobic Respiration
Photosynthesis
Fermentation
Fill in the blank: ________ occurs when there is a difference between the amount of oxygen available and the amount required, and you are 'out of breath'.
Oxygen Debt
Anaerobic Respiration
Lactic Acid Formation
Carbon Dioxide Deficit
Which statement is true about a person in better physical health?
They will feel more sore and out of breath
They are more efficient at transferring oxygen to muscle fibers and will not feel as sore or out of breath
They will stop exercising sooner
They are less efficient at using oxygen
