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Biology Keystone
Homeostasis
Directions: For each of the following multiple choice questions, place the letter of the best answer on
the line provided.
_____ 1.
In the human body, when the blood sugar level rises, a hormone called insulin is released
by the pancreas. This hormone speeds up the movement of sugar out of the blood, so the
blood sugar level decreases and returns to equilibrium. This is an example of:
a. a learned behavior
c. natural selection
b. a feedback mechanism
d. gene expression
_____ 2.
How is homeostasis important to the survival of organisms?
a. Homeostasis makes organisms grow bigger and taller.
b. Homeostasis helps organisms locate food.
c. Homeostasis allows organisms to regulate their temperature.
d. Homeostasis makes all organisms hibernate.
_____ 3.
Homeostasis is the process through which an organism regulates its internal environment
in order to maintain a stable and constant condition. An example of homeostasis is the
regulation of the glucose sugar level in blood through the interaction of the hormones
insulin and glucagon. What happens if the body is unable to maintain its blood glucose
levels?
a. Diseases, such as diabetes and hypoglycemia, result.
b. This regulation is unnecessary to the viability of organisms.
c. New hormones are created to solve the problem.
d. The body adapts to a different blood glucose level.
_____ 4.
Homeostasis is the regulation of metabolic processes within an organism in order to
maintain the stable internal conditions required for life. The human respiratory system
includes the nose, the larynx, and the lungs. This body system helps maintain
homeostasis by
a. transporting oxygen to other organ systems.
b. enabling gas exchange in the body.
c. removing solid waste from the body.
d. regulating hormone levels in the bod
_____ 5.
During heatstroke, the body can't dispose of excess heat. As a result, the homeostatic
balance is disturbed, and internal body temperatures can reach as much as 110°.
Heatstroke is dangerous to people primarily because
a. it causes pneumonia.
b. blood vessels may rupture.
c. blood pressure becomes too low.
d. cells can’t function properly at high temperatures.
_____ 6.
The Golgi apparatus helps to maintain cellular homeostasis by
a. transforming absorbed light energy to manufacture carbohydrates
b. controlling which proteins are synthesized during the cell cycle.
c. synthesizing ATP molecules from glucose during gylcolysis.
d. modifying, sorting, and packaging proteins prior to transport.
_____ 7.
Emphysema is a health condition in which the lungs can no longer expel carbon dioxide
normally. As a result, a person who has emphysema may have high blood acidity levels.
The body process that would attempt to return the blood pH to normal so that cells
could function properly is called _?_.
a. Active transport
c. Acidosis
b. Adaptation
d. Homeostasis
_____ 8.
Which of the following describes how body systems interact to maintain homeostasis?
I. When too much salt and electrolytes are consumed, they are filtered
out of the blood and removed by the kidneys.
II. When body parts, such as muscles, need calcium, it is released from calcium
stored in the bones.
III. When the body temperature rises, the brain signals for an increase in blood
flow to the skin.
a. I only
b. I, II and III
c. II and III only
d. I and III only
_____ 9.
Exocytosis is the process by which vesicles in the cytoplasm fuse with the cell
membrane, releasing their contents into the cell's external environment. This is the
form of transport used by a cell to dispose of large molecules. How does exocytosis help
a cell maintain its homeostasis?
a. Cells must dispose of wastes in order to maintain their homeostasis.
b. In order to maintain their homeostasis, cells must release the exact same chemicals
as they take in.
c. In order to maintain their homeostasis, cells must release large molecules so that
they can replicate themselves.
d. Cells must regularly lose part of their membranes in order to maintain their
homeostasis.
_____ 10.
When Lance goes jogging, his heart rate increases to pump blood faster and supply his
muscles with more oxygen. Which of the following helps to maintain homeostasis in
response to an increase in heart rate?
a. An increase in digestion
c. An increase in respiration
b. A decrease in perspiration
d. A decrease in bone growth
_____ 11.
The diagram to the right shows a major system of the human body.
Which of the following best describes the function of this system.
a. Absorbing nutrients from food.
b. Exchanging gases with the environment
c. Protecting the body from infection
d. Responding to stimuli in the environment
_____ 12.
Which of the following is the best example of an organism
maintaining homeostasis?
a. A wolf panting after a chase
b. A cricket becoming infected by a virus
c. A spider catching an insect in a web
d. A mole digging tunnels in the ground
_____ 13.
Arthrosclerosis is a condition in which substances such as fats and cholesterol are
deposited on the inside walls of arteries, resulting in a decrease in the internal diameter
of the arteries. This directly interferes with which of the following body processes?
a. The production of red blood cells
b. The release of insulin to regulate blood sugar
c. The delivery of oxygen to body tissues
d. The transmission of nerve impulses to the heart
_____ 14.
In which of the following ways does perspiring help the body to maintain homeostasis?
a. By decreasing body temperature
b. By increasing the amount of fluid in the body
c. By increasing blood sugar levels
d. By reducing the amount of carbon dioxide in cells
_____ 15.
Which of the following is a body system response that adjusts body temperature when it
is higher than normal?
a. Breathing rate begins to decrease
b. Sweat glands produce and secrete sweat
c. Blood vessels near the skin contract
d. Hormones increase the metabolic rate of the liver
_____ 16.
Which of the following statements best explains why oxygen diffuses from the alveoli
into the blood?
a. The diaphragm draws oxygen into the alveoli at a rapid speed.
b. Alveoli cells contain hemoglobin to transfer gases to the blood.
c. The concentration of oxygen is greater in the alveoli than in the blood.
d. Red blood cells move one at a time through the capillaries surrounding the alveoli.
_____ 17.
Which of these is an example of feedback in a biological system?
a. The movement of salts from cells into the bloodstream.
b. The release of insulin into the bloodstream when blood sugar increases.
c. The decrease in oxygen levels in the blood after vigorous exercise.
d. The use of energy when muscles contract.
_____ 18.
Mammals, birds, modern reptiles, and the theropod dinosaurs are vertebrates. The
table below shows differences and similarities among these groups of vertebrates.
Birds, mammals and theropod dinosaurs can maintain a constant body temperature. The
ability to maintain a constant body temperature is an example of:
a. Respiration
b. Homeostasis
_____ 19.
Below is a diagram that represents the relationship between two glands. This is an
example of:
a. Polarity
b. Feedback
_____ 20.
c. A reptilian trait
d. An acquired trait
c. Natural selection
d. Anaerobic respiration
Research has led scientists to conclude that fevers help the human body fight infection
by elevating body temperatures and causing parts of the immune system to work better.
Which statement does the conclusion best support?
a. Fevers are a disruption of homeostasis.
b. Fevers should be immediately treated with medication.
c. Fevers are a necessary part of maintaining homeostasis.
d. Fevers are rarely caused by bacterial infections.
Constructed Response. Use the diagram below to answer the constructed response question below.
A) Is the regulation of blood calcium an example of negative or positive feedback?
B) If blood calcium levels are at 15mg/100mL, what responses will occur within the body?
C) Assume that a person has a mutation that doesn’t allow them to make PTH. How will this
person’s blood calcium levels be affected? Explain.