Part D

Which of the following statements best explains how one hormone can regulate several different developmental events?

One hormone can affect different types of target tissues in different ways.

Which of the following things happens during inhalation?

Oxygen-rich air enters the alveoli.

One side of the heart pumps blood into the pulmonary circuit, and the other side of the heart pumps blood to the systemic circuit. How do these different functions affect the structure of the heart?

The left side of the heart has a thicker muscular wall than the right side.

Air that is entering the lungs has?

a higher concentration of oxygen and a lower concentration of carbon dioxide than air in an alveolus.

Which of the following features could be found in a vein, but NOT in an artery?

a one-way valve

In cystic fibrosis, parts of the respiratory tract can become clogged with mucus, inhibiting gas exchange. The area(s) of the respiratory tract where gases are directly exchanged is/are the?

alveoli.

The pulmonary ________ carries ________ blood from the heart to the lungs.

artery; oxygen-poor

The structures that carry signals away from the cell body of a neuron are called?

axons

The blood vessels that allow diffusion between blood and nearby body cells are?

capillaries.

The ________ of a neuron contain(s) all of the structures, such as a nucleus, that are common to animal cells.

cell body.

For a human to inhale, the rib muscles and the diaphragm must?

contract, decreasing pressure inside the lungs.

Which of the following sequences correctly describes the pathway that a signal travels in a neuron?

dendrite to cell body to axon

The branched structures on a nerve cell that receive information are called?

dendrites

Which of the following processes is NOT a function of nephrons?

diffusion of oxygen into body cells

People with sickle-cell disease have deformed hemoglobin molecules and often suffer muscle pains, even at low levels of exertion. These symptoms might occur because the deformed hemoglobin?

is unable to carry the amount of oxygen required for normal muscle activities.

A single hormone molecule can have dramatic effects on a target cell, because?

it initiates a chain of events that amplifies its effect.

Serotonin, one of the hormones thought to be involved in depression, is a water-soluble molecule. Where on the target cell would you expect to find receptors for this hormone?

on the outside of the plasma membrane

The external signals and information that are received by an organism are called?

stimuli

Which of the following statements about hemoglobin is true?

Hemoglobin binds to oxygen and releases it near cells that are performing cellular respiration.

Which of the following statements accurately describes hormonal signaling, as depicted in this figure?

Hormones act on specific target cells.

Which of the following statements accurately describes how hormones can affect a cell, as illustrated in this figure?

Hormones are effective at low concentrations.

Which of the following statements accurately describes hormonal signaling, as depicted in this figure?

Hormones may signal cells that are located a considerable distance away from them.

Which of the following statements about the peripheral nervous system (PNS) is NOT true?

The PNS may integrate and process information.

If the glomerulus remained intact but other capillaries were not in close physical contact with nephrons, which of the following functions would NOT be lost?

filtration of plasma

Once a hormone enters the bloodstream, it?

is broken down after it has performed its function on the target cells.

As you are driving to school one morning, the driver in front of you suddenly slams on his brakes and turns right without using his turning signal. Despite the potentially irritating situation, you remain calm because your ________ helped you control your emotions.

limbic system

The sensory receptor types that provide information about body position and balance to help you coordinate your dance moves are?

mechanoreceptors.

You accidentally rest your hand on a hot stove. This sensory information will ultimately be relayed to the appropriate part of your brain by the?

thalamus.

At high altitudes, gases are less concentrated. You might gasp for air, because?

the amount of oxygen that could diffuse into your blood will be decreased.

Which of the following structures has the smallest diameter?

the bronchioles

As you take this exam, which part of your brain is helping you decide which answer is correct?

the cerebral cortex

By what mechanism do most hormones travel through the organism that produces them?

the circulatory system

Which of the following organs coordinate(s) communication between the endocrine system and the nervous system?

the hypothalamus

Which component of whole blood would an investigator examine to determine the concentration of dissolved carbon dioxide or hormones, such as testosterone?

the plasma

Which of the following does NOT facilitate exchange of materials by diffusion?

the presence of the extracellular matrix within connective tissue

The breaking open of alveoli in people who have emphysema decreases their rate of gas exchange because?

their lungs have less surface area available for diffusion.

Sensory neurons that contain specialized membrane channels activated by moderate temperatures are?

thermoreceptors.

The structure that is highlighted in this figure is the?

trachea.

Large blood vessels that return deoxygenated blood from the legs to the heart are?

veins