ANATOMY LECTURE NOTES #3

1) The nerve responsible for innervation (movement) of the quadriceps femoris muscle is the ___ nerve.

C) femoral

2) A skeletal muscle cell contains hundreds to thousands of ___, which are complex organelles.

A) myofibrils

3) Which spinal nerves contribute to the brachial plexus?

A) C5–T1

4) Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest?

A) a, b, c, d

5) What causes calcium to be released from the sarcoplasmic reticulum?

C) Calcium is released when an action potential reaches the triad.

6) Excitation-contraction coupling is the

C) sequence of processes that links the action potential to contraction.

7) The structure responsible for attaching muscle to bone is a

B) tendon

8) The sciatic nerve is a combination of which two nerves?

C) 3 and 4 only

9) Which protein makes up the thick filaments?

D) Myosin

10) Which is the correct order of the connective tissue layers of a skeletal muscle, beginning with the most superficial?

A) b, c, a

11) A single stimulus-contraction-relaxation sequence in a muscle fiber is known as a(n)

B) twitch.

12) What is the letter associated with the dark bands in a sarcomere?

C) A

13) A sarcomere is defined as the distance from one ___ to the next.

A) Z disc

14) Describe the connective tissue layers associated with skeletal muscle tissue.

B) The epimysium surrounds the entire muscle; the perimysium divides the skeletal muscle into fascicles; the endomysium surrounds individual muscle fibers.

15) Of the muscles listed below which have the action of scapular retraction?

A) a and b only

16) The calcium ions involved in skeletal muscle contraction bind to a(n) ___ subunit.

D) troponin

17) Serratus posterior superior muscle has the action of

C) elevating ribs

18) The neurons that stimulate muscle contraction are called ___ neurons.

C) motor

19) The nerve that innervates the deltoid muscle is

A) axillary nerve.

20) Which of the muscles is innervated by the median nerve?

E) a and c only

21) Which incorrectly describes what happens during skeletal muscle contraction?

A) The Z discs of a sarcomere move farther apart.

22) In skeletal muscle fibers, the plasma membrane junctions with storage containers of calcium. These junctions are called___, the storage containers are called ___, and the invagination of the plasma membrane are called ___.

D) triads, terminal cisternae, t-tubules

23) Gluteus maximus is innervated by

B) inferior gluteal.

24) The membranous network that wraps around myofibrils and holds relatively high concentrations of calcium is known as the

A) sarcoplasmic reticulum.

25) Damage to the pectoralis major would interfere with a person's ability to

B) adduct the humerus.

26) Each thin filament consists of

D) two protein strands coiled helically around each other.

27) The plexus that supplies the upper limbs is the ___ plexus.

B) brachial.

28) Fibularis longus is part of

D) lateral leg compartment.

29) When an impulse arrives at the knob of the motor neuron, calcium

A) enters through voltage-gated channels and triggers the release of transmitter.

30) While dissecting, you removed the gastrocnemius muscle and exposed the

A) soleus.

31) In general, a skeletal muscle is composed of

D) a, b, c, d, e.

32) Place these steps of muscle contraction in the correct order.

A) 2, 4, 1, 3, 5.

33) Gemellus superior has the action of

D) rotating thigh laterally.

34) Place these steps of muscle contraction in the correct order.

C) 2, 4, 1, 3, 5.

35) Longisimmus is part of

A) erector spinae.

36) Following an injury to his arm, a patient complains that he cannot extend the forearm, wrist, and digits. You suspect that he has damaged the

A) radial nerve.

37) The quadriceps femoris is composed of three 'vastus' muscles and the ___

B) rectus femoris.

38) Which are the reservoirs that store the calcium required for muscle contraction?

C) Terminal cisternae.

39) Which structures are reservoirs that store acetylcholine?

B) Synaptic vesicles.

40) Which of the following lists the components of the brachial plexus in correct order starting with the most medial?

B) Rami, trunks, divisions, cords.