Gastrocnemius
yes.
Soleus
The Gastrocnemius (calf muscle) is the primary mover. The Synergist (or assistor) muscle is the Soleus.
The gastrocnemius is a synergist of the soleus.
The synergist muscle is a kind of muscle that performs or helps perform the same set of joint motion as the agonists. Synergist muscle acts on movable joints.
type of contraction of gastrocnemius muscle?
Yes, it is a secondary muscle (synergist/stabilizer) used in the squat. There is a link below in which you can get a chart of the muscles used in a squat: go down about halfway and you'll see the chart.
Risorius muscle
A synergist muscle is a muscle that aids another by promoting the same movement.
The answer would be false. The soleus muscle is superficial to the tibia NOT the gastrocnemius.
The muscle that aids the jaw in closing is the temporalis muscle. The masseter is the muscle that primarily moves the jaw.
Soleus is the muscle that is located directly beneath the gastrocnemius and has similar functions to the gastrocnemius. The hamstrings muscles are a two joint muscle that acts at the knee and hip.
gastrocnemius
No, the gastrocnemius muscle forms the belly of the calf in the lower leg.