AnswersLA-Biology B-CRTopic Test

Topic Test Answers

8 verified answers
1
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Which of the following has the smallest number of cells?

A
blastocyst
B
zygote
C
fetus
D
embryo
2
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Which best describes tonsils and adenoids?

A
Both trap pathogens.
B
Both produce antibodies.
C
Both are found in the nasal cavity.
D
Both maintain fluid balance.
3

Which best describes the testes?

A
They produce hormones and sperm.
B
They are the male copulatory organ.
C
They give sperm nourishment and motility.
D
They are the pouch-like skin that protects the scrotum.
4

During a third-trimester ultrasound, what would a doctor expect to observe in a fetus?

A
initial development of organs
B
response to noise and light
C
presence of a tail-like structure
D
the first heartbeat
5

How does the lymphatic system destroy harmful substances?

A
by drowning them with water
B
by increasing the pH in the body
C
by sneezing and coughing
D
by producing antibodies
6

Which causes a drop in female hormone levels?

A
the onset of the menstrual flow
B
the release of an egg from the ovary
C
the thickening of the uterine wall
D
the failure of an egg to be fertilized
7

A team of scientists is working to formulate a drug that can treat children who are diagnosed with gigantism. Which effect should the drug have on patients?

A
starts the secretion of substances from the adrenal gland that decrease growth
B
increases the secretion of substances from the reproductive glands that stop growth
C
stops the secretion of substances from the thyroid gland that cause growth
D
decreases the secretion of substances from the pituitary gland that cause growth
8

Which of the following statements best describes the role of hormones in the body?

A
Hormones send chemical signals throughout the body to regulate other body processes.
B
Hormones are chemical signals that are sent throughout the body to regulate other body processes.
C
Hormones send electrical signals throughout the body to regulate other body processes.
D
Hormones are electrical signals that are sent throughout the body to regulate other body processes.
9

Which terms best complete the chart about characteristics of human development between fertilization and birth?Stages of Human GestationFirst trimesterSecond trimesterThird trimester- Embryo develops- Organs begin to develop- (1)- Starts swallowing- Fat begins to develop- (2)- All organs are developed- Can hear and see- (3)

A
(1) Facial features form(2) Heartbeat can be heard(3) Nerve cells develop rapidly
B
(1) Heartbeat can be heard(2) Nerve cells develop rapidly(3) Facial features form
C
(1) Nerve cells develop rapidly(2) Facial features form(3) Heartbeat can be heard
D
(1) Facial features form(2) Nerve cells develop rapidly(3) Heartbeat can be heard
10

Heather presented to her class a report about the pancreas. Which statement in Heather’s report was not accurate?

A
The pancreas has both endocrine and exocrine functions.
B
The pancreas regulates blood sugar concentration.
C
The pancreas triggers the development of secondary sex characteristics.
D
The pancreas helps digest fat, protein, and carbohydrates.
11

A disorder causes a human offspring to have 47 chromosomes instead of 46. In which process was there most likely a malfunction?

A
birth
B
blastocyst formation
C
fetal development
D
gametogenesis
12

Which of the following describes the epididymis?

A
a tube that transports sperm to the urethra
B
a vesicle that produces fluid and gives sperm nourishment and motility
C
a gland that contributes fluid to semen
D
a tube that stores and develops sperm cells from the testes
13

Which of the following describes a negative feedback loop?

A
When the heart rate is too high, the body sends hormones that continually increase the heart rate higher.
B
When a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones.
C
When blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows.
D
When a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.
14

Which of the following coordinate and control immune response?

A
B lymphocytes
B
T lymphocytes
C
antigens
D
antibodies
15

Why does lymph need to flow more slowly through the lymph nodes than it flows elsewhere in the body?

A
so that lymph can produce more lymphocytes
B
so that lymph does not backflow into surrounding organs
C
so that lymphocytes can destroy harmful substances in the lymph
D
so that lymph can diffuse and dilute the harmful substances
16

The graph shows the changing levels of hormones during menstruation and ovulation. In general, what happens to the hormone levels between days 21 and 27, just prior to menstruation if the egg was not fertilized?

Question illustration
A
Hormone levels generally decrease.
B
Hormone levels generally rise.
C
Hormone levels remain the same.
D
Hormone levels go in two different directions.
17

What day is considered to be the first day of a female’s reproductive cycle?

A
When hormone levels are low and the uterus lining is shed.
B
When hormone levels are high and the uterus lining is shed.
C
When hormone levels are low and the ovary releases an egg.
D
When hormone levels are high and the ovary releases an egg.
18

The hypothalamus controls excretions from the pituitary gland. It causes the release of some hormones from the pituitary by direct nervous control, and others by secreting releasing and inhibiting factors that stimulate the pituitary to secrete hormones. Which best describes the hypothalamus?

A
It is a connection point between the nervous and endocrine systems.
B
It is both an exocrine and endocrine gland.
C
It is referred to as the “master gland.”
D
It secretes its contents into ducts.
19

What is the purpose of the vas deferens?

A
to store, develop, and transport sperm cells from the testes
B
to release the sperm from the penis
C
to produce seminal fluids to give sperm motility
D
to transport the sperm from the epididymis to the urethra
20

Why is the pituitary gland called the master gland?

A
It is the largest gland in the body.
B
It regulates the work of many glands in the body.
C
It helps the brain master higher-level thinking processes.
D
It controls the heart, which is the master pumping organ in the body.

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