A&P WileyPlus Orion 8-13

Complete PowerPhys Experiment: Action Potentials, and answer this question. Resting Membrane potentional for the pyramidal neuron in this experiment was approximately (approximate because values vary everytime the experiment is performed)

-65 mV

The speed of nerve impulse is determined by all of the following EXCEPT a.) stimulus strength b.) temperature c.) presence of myelin d.) absence of myelin e.) fiber diameter

A.) stimulus strength

Which of the labeled structures in the diagram represents a neurotransmitter receptor?

D

Which labeled structure in the diagram contains the cell bodies of sensory neurons?

Dorsal root ganglion

In the diagram, identify the Schwann cell.

E

Both spinal and cranial nerves have dorsal and ventral roots.

False

Fast-glycolytic fibers contain many capillaries and large amounts of hemoglobin and myoglobin.

False

Glaucoma is caused by abnormally high intracular pressure that results in decreased blood flow that damages the rods and cones.

False

The thick and thin filaments in smooth muscle tissue are arranged in sarcomeres (similar to skeletal muscle), while in cardiac muscle tissue, the filaments are irregularly distributed throughout the cytoplasm.

False

There are four lateral ventricles in the brain.

False

Fear stimulates the activation of the parasympathetic division of the ANS.

False (Parasympathetic = rest & digest) (Sympathetic= fight or flight)

The neuroglia that produce the myelin sheath around axons in the peripheral nervous system are called

Schwann cells

___________ is an acute infection of the peripheral nervous system caused by the herpes zoster virus.

Shingles

The sympathetic or fight or flight division of the ANS is also called the

Thoracolumbar division

A loss of transparency of the lens is know as a cataract.

True

Absence of a normal pupillary light reflex may indicate damage to the brain.

True

Cardiac muscle is striated and involuntary.

True

Changes in the release of the neurotransmitter, dopamine, are associated with Parkinson's disease.

True

During skeletal muscle contraction, the myosin heads pull on actin causing the thin filaments to slide toward the center of the sarcomere.

True

Microglia are macrophages of the CNS.

True

Saltatory conduction occurs only in myelinated axons and involved a nerve impulse jumping from one node of Ranvier to the next.

True

Skeletal muscle tissue is striated and voluntary.

True

Spinal nerves are mixed nerves

True

The loss of the covering produces by oligodendrocytes or schwann cells is callled demyelination.

True

There are twelve pairs of cranial nerves and 31 pairs of spinal nerves.

True

View the "Animation: Membrane Potentials", then answer the question. Pores are membrane transports proteins that are always open.

True

Which of the labeled structures in the diagram is the fourth ventricle?

Under the cerebellum (tree looking)

A motor unit in a skeletal muscle is defined as

all the muscle fibers controlled by a single motor neuron

Lou Gehrig's disease is the common name for a neurodegenerative disease called

amyotrophic lateral sclerosis

Intercalated discs are characteristics structures found in

cardiac muscle

During anaerobic cellular respiration in skeletal muscles, pyruvic acid produced by _____ is converted into ______.

glycolysis; lactic acid

Which of the following is controlled by the sympathetic division of the ANS?

increases heart activites

The attachment of a skeletal muscle at the more movable end is the

insertion

Saltatory conduction

is faster than continuous conduction

Which of the following is an autoimmune disease that results in the destruction of myelin sheaths of neurons in the central nervous system?

multiple sclerosis

Cardiac muscle tissue is

striated, uninucleated, and involuntary

A stimulus strong enough to generate a nerve impulse is called

threshold stimulus

The iris, ciliary body, and choroid are part of the

vascular tunic