CH. 9 HW (A&P)

Predict how contracture (abnormal shortening) of the erector spinae muscle group on the left side of the vertebral column would affect childhood growth and posture.

It can stunt growth on the left side, leading to misalignment of the spine, sitting upright, and difficult breathing.

The temporalis muscle is involved in mastication, or chewing. It has attachments to the temporal bone and the mandible. ____ serves as the origin, and ____ is the insertion.

Temporal; mandible

The gluteus maximus is the most powerful muscle during __________.

extension

A muscle that anchors a bone in place to make the movement more efficient is a(n) __________.

fixator

The majority of the fibers of the gluteus maximus insert onto the __________.

iliotibial tract

Which of the following is a neck muscle? platysma gracilis serratus anterior mentalis

platysma

The pectoralis minor muscle moves the scapula anteriorly and downward, meaning it __________ and __________ the bone.

protracts and depresses

The insertion of the biceps brachii muscle is the __________.

radial tuberosity

Which of the following muscles will be used to flex the trunk while performing sit-ups?

rectus abdominis

Which of the following is NOT one of the functions of skeletal muscle? generation of facial expressions voluntary control over defecation and urination regulation of the diameter of blood vessels and control of blood pressure thermoregulation

regulation of the diameter of blood vessels and control of blood pressure

All fibers of the trapezius muscle are innervated by the __________.

spinal accessory nerve

Mr. Dawson is planning to visit his cosmetic surgeon for Botox® injections to remove wrinkles around his mouth and on his forehead. This treatment involves temporarily paralyzing the orbicularis oris muscle, the frontalis muscle, and the corrugator supercilii muscle, respectively. Afterward, what movements will he be unable to perform?

Mr. Dawson will not be able to whistle or show full expressions with eyebrows when sad.

Predict the name that might be assigned to a muscle that attaches to the sternum and the hyoid bone.

Sternohyoid

Which of the following muscles does NOT belong to the quadriceps femoris group? vastus medialis vastus lateralis biceps femoris rectus femoris

biceps femoris

The name orbicularis oris means "__________."

circular muscle in the mouth area

The trapezius muscle may be separated into all of the following groups, except __________.

lateral

The origins of the lateral head of the gastrocnemius muscle are the __________.

lateral condyle and posterior surface of the femur

The two heads of the gastrocnemius muscle converge to insert onto __________.

the calcaneus

The gastrocnemius muscle is innervated by the __________.

tibial nerve