Mark the following statements as true or false. If the statement is false, correct it to make a true statement.
The latissimus dorsi muscle is a major abductor of the arm

What class of lever system do the following activities describe?

a. The soleus muscle plantar flexes the foot.

b. The triceps brachii is strained while doing pushups.

Mary sees Jill coming toward her and immediately contracts her frontalis and procerus. She also contracts her right levator labii. Is Mary glad to see Jill? How can you tell?

While unloading her car trunk, Amy strains a muscle and as a result has difficulty moving her arm. The doctor in the emergency room tells her that she strained her pectoralis major. Amy tells you that she thought the pectoralis major was a chest muscle and doesn't understand what that has to do with her arm. What should you tell her?

Which eye muscle passes through the trochlea and turns the eye inferiorly and laterally?

a. Lateral rectus muscle

b. Inferior rectus muscle

c. Inferior oblique muscle

d. Superior oblique muscle

Which of the following muscles flexes the thigh, but also laterally flexes the vertebral column when its origin and insertion switch?

a. Sartorius muscle

b. Psoas major muscle

c. Iliacus muscle

d. Rectus abdominis muscle

Match the muscle with its main action:

____Vastus medius muscle     

____Gracilis muscle     

____Gluteus medius muscle     

____Gastrocnemius muscle     

____Biceps femoris muscle     

____Tibialis anterior muscle

a. Adducts thigh

b. Extends thigh and flexes leg

c. Plantarflexes foot

d. Abducts thigh

e. Dorsiflexes foot

f. Extends leg

Explain how the diaphragm muscle is able to increase the size of the thoracic cavity even though it doesn't insert into a bone.

Why do you think that the muscles of the erector spinae and transversospinal muscle groups remain in a state of continual contraction when we are upright?