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Science in Action: Human Body
1. Sandra measured her heart rate and her breathing
rate at rest and again after doing 50 jumping jacks.
What is the main reason that both her heart rate
and her breathing rate went up with exercise?
a. They both sped up to supply her working
muscles with enough oxygen to remain in
homeostasis.
b. Her lungs and heart ran short on oxygen
while she was exercising and sped up to
maintain homeostasis.
c. Her muscles were out of shape and
required extra blood and oxygen in order to
maintain her jumping pace.
d. They both increased in order to carry heat
away from her working muscles more
efficiently.
Explain:
2. In order to maintain homeostasis, the systems of
the human body work together to keep a constant
internal temperature. Which of the following
statements describes how the human body
responds in a cold environment?
a. The nervous system moves the jawbones
and causes the chattering of teeth.
b. The nervous system signals the muscles of
the muscular system to contract and warm
the body.
c. The circulatory system delivers less carbon
dioxide to the muscular system, resulting in
stiffening of the muscles.
d. The skeletal system produces more blood
cells that circulate through the blood
vessels, increasing the warmth of the body
4. Viruses and bacteria are both microorganisms that
cause disease. Which of these is a difference
between viruses and bacteria?
a. Viruses reproduce on their own, while
bacteria require a host.
b. Bacteria reproduce on their own, while
viruses require a host.
c. Both viruses and bacteria require a host to
reproduce.
d. Both viruses and bacteria can reproduce
without a host.
Explain:
5. Which of the following is a direct interaction of the
skeletal, muscular, and nervous systems?
a. Feeling tired after eating a meal
b. Movement of a person’s arm
c. Healing of a cut on the arm
d. Increased production of hormones
Explain:
6. The survival of a cell depends on the cell
maintaining homeostasis. What is MOST likely to
happen to a cell if homeostasis is not maintained?
a. The cell will immediately divide
b. Cell processes will continue unchanged.
c. The cell will eliminate wastes more
efficiently.
d. Many chemical reactions in the cell will
slow down or even stop.
Explain:
Explain:
3. Which is the smallest structure in the hierarchical
organization of living things?
a. Cell
b. Tissue
c. Organ
d. Organ system
Explain:
7. Locomotion is a controlled movement which
includes activities like walking and running. Which
systems directly assist in these activities?
a. muscular, skeletal, and nervous
b. muscular, immune, and digestive
c. nervous, respiratory, and digestive
d. skeletal, circulatory, and immune
Explain:
8. The temperature of a cell’s environment increases
by 50C. If the cell is to maintain homeostasis, what
must happen?
a. The cell must maintain its internal
temperature.
b. The cell must increase its internal
temperature by 50C.
c. The cell must decrease its internal
temperature by 50C.
d. The cell must absorb heat from the
environment to reset the temperature.
Explain:
9. Which of these statements describes an organ
system?
a. many cells working together to perform a
function
b. many organs working together to perform a
function
c. many cells working separately to perform
different functions
d. many organs working separately to perform
different functions
Explain:
10. Which of these statements describes a tissue?
a. many cells working together to perform a
function
b. many organs working together to perform a
function
c. many cells working separately to perform
different functions
d. many organs working separately to perform
different functions
Explain: