Quiz Questions

Which of the following occurs as air is drawn through the nose?

Air is warmed, filtered, and humidified.

True or False: Control systems most likely involved in maintaining homeostasis are termed positive feedback.

False

All of the following statements about the endocrine system are TRUE EXCEPT which one?

Hormones act more quickly than the nervous system.

Which one of the following best explains why humans must constantly breathe in oxygen in order to stay alive?

Oxygen is essential for the production of most of the ATPs required to fuel cell functions.

A student is designing an experiment to show the effects of the movement of water across a selectively permeable membrane. He places a highly concentrated saltwater solution into a bag that is permeable only to water. He then submerges the bag into a beaker of pure water. Which one of the following can be expected?

The net flow of water will be from the beaker into the bag, causing the contents of the bag to increase in volume.

The cardiac cycle consists of a period of heart contraction called systole and a period of heart relaxation called diastole. (T/F)

True

A codon is

a sequence of three nitrogenous bases on mRNA that corresponds to an amino acid.

During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which one of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine (T)?

adenine

Cardiac muscle differs from skeletal muscle in that

all cardiac muscle is under involuntary control.

Which one of the following best describes the proper sequence of steps involved in the scientific method? a - state hypothesis b - observe c - experiment d - support or disprove hypothesis e - form a prediction

b, a, e, c, d

A goiter results from low dietary iodine levels

because T3/T4 cannot be made, which results in overstimulation by TSH.

Most of the carbon dioxide released by cells is transported in the venous supply in what form?

bicarbonate

Bacterial and viral infections of the brain are rare because the ________ prevents most viruses, proteins, and bacteria from entering the cerebrospinal fluid.

blood-brain barrier

The central nervous system is composed of which of the following?

brain and spinal cord

Conscious thought is associated with which one of the following?

cerebrum (forebrain)

DNA is organized and arranged in the nucleus as

chromosomes

Which one of the following types of neurotransmitter functions as an inhibitory agent, typically suppressing the sensation of pain?

endorphins

The three main anatomical and functional divisions of the brain are the

forebrain, midbrain, hindbrain.

Electrical impulses are transmitted between components of the central nervous system via which one of the following?

interneurons

The pituitary gland is often called the "master of the endocrine system" because

it secretes eight different hormones that in turn regulate many of the other endocrine glands.

Over the course of evolutionary time, animal body sizes have gotten larger, yet cell sizes have not. Cells have stayed proportionally the same size to remain efficient, because

larger cells would become limited by the ability to move materials across the plasma membrane.

Control of respiratory rate, heart rate, and blood pressure is integrated through the

medulla oblongata (hindbrain)

Human cells have a membrane-bound ________ that contains the genetic material.

nucleus

Which one of the following is considered an accessory digestive organ?

pancreas

Once an RNA molecule has been made from DNA, it enters the cytoplasm of the cell where it is used by the cell to produce a

protein

A neuron at rest has a charge difference across its cell membrane, with the interior of the cell negative relative to the exterior. This difference in charge across the plasma membrane is referred to as ________ potential.

resting

After blood flows through the right atrium of the heart, its next major destination is the

right ventricle

Which one of the following provides the central nervous system with information about the outside environment?

sympathetic division

Nutrient-rich blood moves from the small intestine to the liver via

the hepatic portal system.

Oxygen and carbon dioxide are able to pass through the plasma membrane of a cell because

they are small and nonpolar and readily pass between phospholipids.

Organisms that can contain genes introduced from other species are referred to as

transgenic