A&P I- Lecture Exam #3

Match the neuron anatomy with its function

1. Receptive processes → Dendrite

2. Biosynthetic and metabolic center → Soma

3. Conducting Processes → Axon

4. Point of communication → Synapse

Recruitment of different types of motor units in a muscle is one means of varying the amount of tension generated in that muscle.

True

Cardiac muscles differ from skeletal muscles in that they ________.

contain intercalated discs

Which statement is true concerning the knee joint?

the medial meniscus is attached to the tibial collateral ligament

Intramembranous ossification ________.

produces the bones of the top and sides of the skull

In spina bifida occulta the laminae of the affected vertebrae fail to form the spinous process

True

Which type of joint allows for only uniaxial movement?

hinge joint

All false ribs attach to the costal cartilage of the true ribs

false

The chemical curare is a nicotinic receptor antagonist. How will curare affect skeletal muscle function?

It will cause flaccid paralysis (no muscle contraction possible)

Match the glial cell with its function

GOT IT PARTIALLY WRONG!

Astrocyte→ support, brace, and anchor neurons within the PNS

Ependymal cells → produce and circulate CSF

Microglia → resident macrophages

Oligodendrocytes → myelinate axons within the CNS

Satellite Cells → support, brace, and anchor neurons within the CNS

Schwann Cells → myelinate axons within the PNS

Which type of fibrous joint connects the tibia and fibula?

syndesmosis

In relaxed muscle, the myosin-binding site on actin is blocked by _______.

tropomyosin

Select all of the following which would happen if ATP is removed from the skeletal muscle cell.

calcium would remain in the sarcoplasm keeping the muscle contracted, and myosin would not unbind from actin

What type of input do EFFERENT neurons carry?

motor

At a synovial joint, the synovial membrane ________.

secretes the lubricating synovial fluid

Ligand gated channels will open in response to the binding of a neurotransmitter.

true

With respect to their direct effects on osseous tissue, which pair of hormones has actions that oppose each other?

calcitonin and calcitriol

calcitonin and parathyroid hormone

estrogen and progesterone

Where is the temporalis muscle located?

on the side of the head

Match the muscle of the neck and trunk with the best description of its action.

Sternocleidomastoid → bilaterally flex neck, tilt and rotate head to the side

Erector spinae group → primary extensors of VC

Segmental group → stabilize VC

Intertransversarii → laterally flex VC
Interspinales →extends VC

Diaphragm → prime mover for compression and expansion of the thoracic cavity and associated changes in abdominal cavity

Internal Intercostals → draw ribs together and constrict thoracic cage for forced exhalation

External Intercostals →raises and expands rib cage

External oblique → Compresses the abdomen, depresses ribs, flexes and rotates vertebral column

Rectus abdominis →Compresses the abdomen, depresses the ribs, flexes the vertebral column

Transversus abdominis →compresses abdomen

Quadratus lumborum → Posterior abdominal wall, prime mover of lateral flexion

Which of the following statements is true?

Fast fibers have large glycogen reserves

Which of the following terms describes fascicles which run at a non-orthogonal (right) angle?

oblique

When comparing adult and fetal skulls, fetal skulls _____.

lack styloid and mastoid processes

Procaine (Novocain) is a drug that blocks voltage-gated Na + channels. When present, what would happen in a neuron?

Graded potentials are possible, but the neuron will not have the depolarizing phase of the action potential

Which motion moves the bottom of the foot away from the midline of the body?

eversion

The primary support for the glenohumeral joint is provided by the ________.

rotator cuff muscles

Which is FALSE about neurons?

A neuron receives information on its axons and delivers it to other neurons through its dendrites.

During concentric isotonic contraction of a skeletal muscle fiber, which of these occurs?

I bands shorten