Question

question 7
painful muscle contractions or involuntary twitches are called:
tetanic contractions.
cramps.
convulsions.
fibrillations.
question 8
which type of muscle does not have t - tubules?
smooth
cardiac
striated
all muscles have t - tubules.
question 9
the opposite of dorsiflexion is:
dorsiextension.
abduction.
plantar flexion.
none of the above.

Explanation:

• Question 7: Cramps are painful muscle contractions or involuntary twitches. Tetanic contractions are a different type of sustained contraction. Convulsions are more related to involuntary movements of the whole - body or large muscle groups often due to neurological issues. Fibrillations are abnormal muscle fiber contractions at a smaller scale.
• Question 8: Smooth muscles do not have T - tubules. Cardiac and striated muscles have T - tubules which are important for the rapid spread of electrical signals.
• Question 9: Dorsiflexion is the movement that brings the top of the foot towards the shin. Plantar flexion, which is the movement that points the foot downwards, is the opposite of dorsiflexion. Dorsiextension is not a standard anatomical term in this context, and abduction is the movement away from the mid - line of the body.

Answer:

Question 7: cramps.
Question 8: Smooth
Question 9: plantar flexion.