bio exam 3

Which best describes the protective action of blinking?

A sensory receptor detects motion, a sensory neuron sends this information to the spinal cord, and the information in the central nervous system (CNS) sends a message back to blink.

Which statement about Alzheimer's disease is true?

Alzheimer's disease is age-related, increasing in frequency as people age.

Which part of this diagram of a neuron depicts the axon?

D

Which brain region controls the secretion of pituitary hormones and exerts direct control over many other aspects of homeostasis?

Hypothalamus

Which statement regarding the nervous system is true?

Motor neurons convey signals from the CNS to effector cells.

The functional unit of the nervous system is the

Neuron

Which statement about ion channels and voltage-gated ion channels is true?

Voltage-gated ion channels only open when a stimulus is applied.

Which statement about resting potential is true?

Which statement about resting potential is true? Group of answer choices

During practice, a soccer player got hit in the head. After a few minutes, she was able to get up and went to the sidelines to get a bottle of water. As she was walking she felt extremely dizzy and fell over. What part of her brain may have been damaged? Group of answer choices

cerebellum

You start to fall but then catch yourself, regaining your balance. Which of the following brain regions is responsible for the rapid coordination of muscle activity that kept you from falling?

cerebellum

Nervous system effector cells

include muscle cells and gland cells.

Parkinson's disease

is a motor disorder, affecting physical movements of the body.

A physician friend of yours is telling you about a patient with a head injury who suddenly stopped breathing. Your friend explains that the bony rim was pressing against the breathing center. You guess that the "bony rim" (whatever that is) must have been exerting pressure in the region of the

medulla oblongata and pons.

The speed of impulse conduction along an axon may be increased by

myelin sheaths.

The signal that crosses a synapse is stopped when the

neurotransmitters are enzymatically broken down or transported back to the signaling cell.

You are practicing throwing baseballs long distances with the members of your baseball team. At the same time that your partner throws the ball to you, another player across from you throws his baseball off-target, and it heads straight toward you. You hold your baseball glove up to catch your partner's ball, and you instinctively throw up your other arm to protect your face from the other incoming ball. The protective action of throwing up your arm is an example of a(n) Group of answer choices

reflex

Which results from stimulation by the sympathetic nervous system

release of glucose from the liver

Once an action potential is triggered, there is a

reversal of the membrane polarity, with the interior of the cell becoming positively charged.

Treatments for depression often include drugs that help correct imbalances in the levels of

serotonin

The central communication conduit between the brain and the rest of the body is the

spinal cord

When you are very nervous, perhaps before you must speak in front of your class, you notice that your mouth is dry and your heart is racing. This is most likely due to stimulation by the

sympathetic division of your autonomic nervous system.