Skeletal muscle

Which of the following is not a phase of a muscle twitch?

• latent period

• excitatory phase

• contraction phase

• relaxation phase

Which ion is released from the sarcoplasmic reticulum?

• Ca2+

• K+

• Na+

• Cl-

True/False: During cross bridge cycling ATP binding to the ATPase site on myosin causes a conformational change of the myosin head. This results myosin and actin separating from each other.

• true

• false

As a load increases the shortening velocity of a muscle _______(increases/decreases)

True/false: During contractile events the thick filaments (known as the A band) will not shorten

• true

• false