BSC 1020 Human Biology - Chapter 06 - The Muscular System

Which one of the following is the action of the orbicularis oris:

A. closes, purses, and protrudes the lips

Which one of the following muscles is involved in abduction of the arm at the shoulder joint:

A. deltoid

Which one of the following is composed of myosin protein:

A. thick filaments

Which of the following is NOT a function of the muscular system:

E. hematopoiesis

Paralysis of which of the following would make an individual unable to flex the hip:

E. iliopsoas

An elaborate and specialized network of membranes in skeletal muscle cells that function in calcium storage is the:

E. sarcoplasmic reticulum

Acetylcholine is:

E. a neurotransmitter that stimulates skeletal muscle contraction

Which of the following muscles closes the jaw:

E. both masseter and temporalis

Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract:

B. acetylcholine (ACh) causes temporary permeability to sodium

During skeletal muscle contraction, myosin heads attach to active sites of:

B. actin filaments

A sarcomere is:

B. the contractile unit between two Z discs

The mechanical force of contraction is generated by:

C. a sliding of thin filaments past thick ones

Why are calcium ions necessary for skeletal muscle contraction:

C. calcium triggers the binding of myosin to actin

The movement opposite to abduction is:

D. adduction

A nursing infant develops a powerful sucking muscle that adults also use for whistling or blowing a trumpet called the:

D. buccinator

What is the main function of the quadriceps femoris group:

D. knee extension

Which one of the following does NOT compress the abdomen:

D. latissimus dorsi

Which of these muscles is NOT located in the head:

D. sartorius

Creatine phosphate (CP) functions within the muscle cells by:

D. storing energy that will be transferred to ADP to resynthesize ATP as needed

The gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell is called the:

D. synaptic cleft