Question 31

Anemia is the decreased ability of ______ to supply adequate oxygen to the body's cells.

white blood cells

red blood cells

platelets

none of the above

1 points
Question 32

The lymphatic system functions in the absorption of ______.

excess fluid

fat

both a and b

none of the above

1 points
Question 33

Which of the following is NOT a level of defense in the human body?

physical barriers

non-specific defense mechanisms

specific defense mechanisms

none of the above

1 points
Question 34

Which of the following is NOT a barrier to entry?

saliva

tears

mucous membranes

none of the above

1 points
Question 35

Which of the following is NOT a sign of inflammation?

swelling

pain

redness

none of the above

1 points
Question 36

The ______ system produces antibodies against specific pathogens.

nervous

endocrine

immune

none of the above

1 points
Question 37

Macrophages are ______ blood cells that continually patrol the body in search of foreign molecules.

red

plasma

white

none of the above

1 points
Question 38

Vaccines are weakened ______ that prompt the development of antibodies but not the disease.

viruses

bacteria

both a and b

none of the above

1 points
Question 39

People with type O blood can donate blood to ______.

only other people with O blood

no one

anyone

none of the above

1 points
Question 40

During an allergic reaction, cells release histamine, which starts the ______ response.

excretory

inflammatory

nervous

none of the above

1 points
Question 41

Autoimmune diseases result when the ______ system attacks and destroys cells and tissues of the body.

immune

nervous

digestive

none of the above

1 points
Question 42

Animals are heterotrophs that derive their energy from _______.

chemicals

the sun

another organism

none of the above

1 points
Question 43

The ______ breakdown of food is accomplished by enzymes.

physical

chemical

mechanical

none of the above

1 points
Question 44

Ingestion is the ______ stage of digestion.

third

second

first

none of the above

1 points
Question 45

The biliary system consists of accessory ______ organs.

reproductive

digestive

cardiovascular

none of the above

1 points
Question 46

Muscular contractions of the ______ are known as peristalsis.

esophagus

diaphragm

trachea

none of the above

1 points
Question 47

Once food passes from the mouth and down the ______, it enters the stomach.

trachea

small intestine

esophagus

none of the above

1 points
Question 48

The small intestine is where final ______ occurs.

absorption

digestion

both a and b

none of the above

1 points
Question 49

The liver sends ______ to the small intestine.

insulin

gastric juices

bile

none of the above

1 points
Question 50

Movements within the ______ are due to involuntary muscle contractions.

large intestine

anus

esophagus

none of the above

1 points
Question 51

Which of the following is a macronutrient?

carbohydrates

lipids

amino acids

all of the above

1 points
Question 52

Exoskeletons are found on the ______ of the body.

outside

inside

both a and b

none of the above

1 points
Question 53

Muscles for movement attach to the inner surface of the ______.

endoskeleton

exoskeleton

both a and b

none of the above

1 points
Question 54

Which of the following is a part of the vertebrate skeleton?

lateral

axial

both a and b

none of the above

1 points
Question 55

The upper bone of the ______ is the humerus.

spinal column

leg

arm

none of the above

1 points
Question 56

The ______ layer of the bones is known as the periosteum.

outer

inner

both a and b

none of the above

1 points
Question 57

Eventually, the ______ stops, and the cartilage is all converted into bone.

elongation

shortening

contraction

none of the above

1 points
Question 58

Immovable joints join the bones of the ______.

shoulder

jaw

skull

none of the above

1 points
Question 59

When one muscle contracts, what does the other do?

stays still

contracts

relaxes

none of the above

1 points
Question 60

Within each myofibril there are dense ______.

sarcomeres

Z lines

cilia

none of the above

1 points
Question 61

Motor neuron axons from nerve cells connect to ______ fibers.

ligament

muscle

tendon

all of the above

1 points
Question 62

Animals exchange ______ via their respiratory systems.

fluids

minerals

gases

none of the above

1 points
Question 63

______ vertebrates use only lungs to exchange gases.

Terrestrial

Aquatic

Amphibian

none of the above

1 points
Question 64

Gills are typically outgrowths of ______ or clustered strands of filaments.

capillaries

organs

tissue

none of the above

1 points
Question 65

The epiglottis prevents food from entering the _______.

esophagus

trachea

stomach

none of the above

1 points
Question 66

______ branch into smaller and smaller tubes known as bronchioles.

Vocal cords

Alveoli

Bronchi

all of the above