How does an action potential enter a skeletal muscle cell?
a: As a result of the interaction between actin and myosin
b: Through a T tubule
c: In response to the release of calcium ions
d: By diffusion
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b: Through a T tubule
Mature sperm are stored in the
a: prostate gland.
b: seminal vesicles.
c: epididymis.
,d: urethra.
e: penis.
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c: epididymis.
Which of the following describes the role of urinary systems in maintaining cellular
homeostasis?
a: Urinary systems are important for the generation of urea, which cells can use as an
energy source when carbohydrates become scarce.
b: Urinary systems filter out diseased and damaged cells that can be excreted from
the body.
c: Urinary systems ensure the delivery of the proper amount of nitrogen to the cells.
d: Urinary systems regulate water balance, pH, and the concentrations of ions in body
fluids for cells.
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d: Urinary systems regulate water balance, pH, and the concentrations of
ions in body fluids for cells.
Which is the correct sequence of structures through which light passes in the eye?
a: Lens → pupil → cornea → aqueous humor → retina
b: Cornea → aqueous humor → pupil → lens → vitreous humor → retina
c: Lens → cornea → vitreous humor → retina → aqueous humor → pupil
d: Pupil → vitreous humor → aqueous humor → retina → cornea
e: Aqueous humor → cornea → lens → pupil → retina → vitreous humor
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, b: Cornea → aqueous humor → pupil → lens → vitreous humor → retina
Cnidarians have what type of skeleton?
a: They don't have a skeleton
b: Endoskeleton
c: Exoskeleton
d: Hydrostatic skeleton
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d: Hydrostatic skeleton
In the lungs, oxygen moves from air into blood by
a: facilitated diffusion.
b: diffusion.
c: bulk flow.
d: active transport.
e: osmosis.
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b: diffusion.
ADH increases fluid retention when the body sweats and decreases fluid retention
when someone has consumed large amounts of water. This is an example of
a: positive feedback.
, b: negative feedback.
c: neurotransmitter activity.
d: paracrine communication.
e: synaptic communication.
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b: negative feedback.
Which of the following statements is TRUE regarding a gastrovascular cavity?
a: Digestion is unnecessary because of the small size of the particles absorbed.
b: Ingestion and elimination occur through a single opening.
c: Digestion occurs in specialized chambers.
d: Absorption occurs within collar cells.
e: Digestion is exclusively intracellular.
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b: Ingestion and elimination occur through a single opening.
If you find a brightly colored insect resting on a dead leaf, the insect is likely to
a: be poisonous or distasteful.
b: be prey for birds.
c: have aggressive mimicry.
d: be camouflaged.
e: have startle coloration.
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a: As a result of the interaction between actin and myosin
b: Through a T tubule
c: In response to the release of calcium ions
d: By diffusion
Give this one a try later!
b: Through a T tubule
Mature sperm are stored in the
a: prostate gland.
b: seminal vesicles.
c: epididymis.
,d: urethra.
e: penis.
Give this one a try later!
c: epididymis.
Which of the following describes the role of urinary systems in maintaining cellular
homeostasis?
a: Urinary systems are important for the generation of urea, which cells can use as an
energy source when carbohydrates become scarce.
b: Urinary systems filter out diseased and damaged cells that can be excreted from
the body.
c: Urinary systems ensure the delivery of the proper amount of nitrogen to the cells.
d: Urinary systems regulate water balance, pH, and the concentrations of ions in body
fluids for cells.
Give this one a try later!
d: Urinary systems regulate water balance, pH, and the concentrations of
ions in body fluids for cells.
Which is the correct sequence of structures through which light passes in the eye?
a: Lens → pupil → cornea → aqueous humor → retina
b: Cornea → aqueous humor → pupil → lens → vitreous humor → retina
c: Lens → cornea → vitreous humor → retina → aqueous humor → pupil
d: Pupil → vitreous humor → aqueous humor → retina → cornea
e: Aqueous humor → cornea → lens → pupil → retina → vitreous humor
Give this one a try later!
, b: Cornea → aqueous humor → pupil → lens → vitreous humor → retina
Cnidarians have what type of skeleton?
a: They don't have a skeleton
b: Endoskeleton
c: Exoskeleton
d: Hydrostatic skeleton
Give this one a try later!
d: Hydrostatic skeleton
In the lungs, oxygen moves from air into blood by
a: facilitated diffusion.
b: diffusion.
c: bulk flow.
d: active transport.
e: osmosis.
Give this one a try later!
b: diffusion.
ADH increases fluid retention when the body sweats and decreases fluid retention
when someone has consumed large amounts of water. This is an example of
a: positive feedback.
, b: negative feedback.
c: neurotransmitter activity.
d: paracrine communication.
e: synaptic communication.
Give this one a try later!
b: negative feedback.
Which of the following statements is TRUE regarding a gastrovascular cavity?
a: Digestion is unnecessary because of the small size of the particles absorbed.
b: Ingestion and elimination occur through a single opening.
c: Digestion occurs in specialized chambers.
d: Absorption occurs within collar cells.
e: Digestion is exclusively intracellular.
Give this one a try later!
b: Ingestion and elimination occur through a single opening.
If you find a brightly colored insect resting on a dead leaf, the insect is likely to
a: be poisonous or distasteful.
b: be prey for birds.
c: have aggressive mimicry.
d: be camouflaged.
e: have startle coloration.
Give this one a try later!
