AnswersCO-Biology B-CRUnit Test

Unit Test — Unit test Answers

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1
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When is the most likely time for a female to become pregnant during her menstrual cycle?

A
on the first day of her period
B
on the last day of her period
C
about a week after her period ends
D
about a week before her period begins
2
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A commercial on television advertises a new medicine that claims to boost immunity. You want to verify that the claim is scientifically based. Which source is least likely to provide you with accurate information about this new medicine?

A
a magazine about entertainment and lifestyle trends
B
the studies that the television ad cites
C
a brochure from the doctor’s office
D
the website of the governmental agency that tests health products
3

Which organ systems work together to help the body shiver in order to maintain homeostasis?

A
circulatory and respiratory
B
nervous and muscular
C
circulatory and muscular
D
respiratory and nervous
4

Which person’s function in a school is similar to the central nervous system’s role in a human body?

A
a cafeteria worker
B
a student
C
a principal
D
a bus driver
5

Which best describes the muscular system?

A
The muscular system is made up of about 150 muscles.
B
The muscular system helps in digestion and circulation.
C
The muscular system allows conduction of nerve impulses.
D
The muscular system allows for movement by pushing.
6

The graph shows the changing levels of hormones during menstruation and ovulation. Which hormone has the most influence on preparing the body for pregnancy?

Question illustration
A
Luteinizing hormone promotes fertility because it spikes the most during ovulation.
B
Estradiol promotes fertility because it peaks slightly before ovulation.
C
Progesterone promotes fertility because its levels rise during ovulation and immediately after.
D
Follicle-stimulating hormone promotes fertility because it is released mostly during ovulation.
7

Which action is a physical change in digestion?

A
producing enzymes for nutrient absorption
B
absorbing nutrients from food
C
mashing food with teeth
D
salivating to break food into carbohydrates
8

The brain and spinal cord work together so the body can receive signals and react to the environment. What is the spinal cord?

A
a cell
B
a tissue
C
an organ
D
an organ system
9

During digestion, water is both added and removed. Which area of the digestive system removes water?

A
mouth
B
esophagus
C
liver
D
large intestine
10

What is the main component of the thin filaments in muscle fibers and is responsible for muscle contraction?

A
actin
B
myosin
C
ATP
D
DNA
11

Justine was feeling very sick. She went to the doctor, who told her she had a bacterial infection and withdrew blood for blood work.Which component in Justine’s blood would be higher than normal?

A
plasma
B
white blood cells
C
red blood cells
D
platelets
12

[BLANK]

A
sugar
B
urine
C
blood
D
saliva
13

The body obtains sugar from food. Which system most directly affects blood sugar levels?

A
respiratory
B
muscular
C
circulatory
D
digestive
14

How is a brain injury classified?

A
as an injury of the peripheral nervous system
B
as an injury of the central nervous system
C
as an injury of the autonomic nervous system
D
as an injury of the somatic nervous system
15

How will Richard’s body react when a friend jumps in front of him and scares him?

A
Richard’s central nervous system will take over, and his peripheral nervous system will play a lesser role.
B
Richard’s peripheral nervous system will take over, and his central nervous system will play a lesser role.
C
Richard’s sympathetic nervous system will take over, and his parasympathetic nervous system will play a lesser role.
D
Richard’s parasympathetic nervous system will take over, and his sympathetic nervous system will play a lesser role.

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