A&P Chapter 9 Exam

A fracture of the mandible would have the most limiting effect on which of the following activities?

• Urination

• Walking

• Eating

• Hearing

Which of the following best describes a sarcomere?

• A part of the sarcoplasmic reticulum

• A group of fascicles

• A group of myofibrils

• A unit within a myofibril

Which of the following represents the large, thick muscle which causes the bulge in the calf?

• Gastrocnemius

• Extensor hallucis longus

• Peroneus longus

• Sartorius

Which muscle provides almost all of the contractile force needed to extend the forearm?

• Triceps brachii,

• Brachioradialis

• Biceps brachii

• Brachialis

Which number in the diagram of the anterior view of the human skeletal muscle system points to the rectus abdominus?

• 2

• 4

• 1

• 3

What generates the mechanical force of contraction (shortening) in skeletal muscle?

• The action of actin and myosin sliding past each other.

• Relaxation of thick and thin filaments

• Shortening of the thick filaments

• Shortening of the thin filaments

Which number in the diagram of the posterior view of the human skeletal muscle system points to the trapezius?

• 3

• 6

• 5

• 1

In skeletal muscle tissue, which structure marks the endpoints of sarcomeres?

• A bands

• Z lines

• Thin filaments

• Thick filament

Muscle fatigue is the result of the lack of ____ and the production of _____

• Lactic acid/oxygen

• Oxygen/lactic acid

• Glucose/ oxygen

• Oxygen/ glucose

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

What type of connective tissue attaches skeletal muscles to bones?

• Cartilage

• Ligaments

• Tendons

• Fascicles