BIO 152 — EXAM 2 WITH CORRECT
ANSWERS 2025
homeostasis correct answers >> process by which organisms
maintain a relatively stable internal environment
What do homeostatic systems do? correct answers >> act
quickly to return environment to homeostasis
what are the three components of a homeostatic system?
correct answers >> -sensor
-integrator
-effector
sensor correct answers >> senses some aspect of external or
internal environment
integrator correct answers >> evaluated the incoming
sensory information and decides whether a response is needed
effector correct answers >> help restore the environment to
desired conditions
the integrator is usually ___ _____ but it can be _ _____. correct
answers >> the brain, a gland
,negative feedback correct answers >> effectors reduce or
oppose the change
the most common type of feedback is ________ correct answers
>> negative
endotherms (4) correct answers >> -produce adequate heat
to warm themselves
-body temperature stays the same
-most birds and mammals
-heat from metabolic fuel and insulation
ectotherms (4) correct answers >> -rely on heat from
environment
-body temperature changes throughout day
-most invertebrates, fish, amphibians and reptiles
-not very active in morning or at night
what are the four components of cellular communication?
correct answers >> -signaling cell
-signaling molecule
-receptor protein
-responding cell
signaling cell can be a _______, _____, or ___ correct answers
>> peptide, lipid, or gas
, briefly explaining cellular communication correct answers >>
a signaling cell is the source of a signaling molecule, which binds
to a receptor protein on or in the resounding cell which then
results in change of activity
what is the four step process once receptor is bound? correct
answers >> 1. receptor is activated by signal, causes
conformational change
2. receptor triggers signal transduction
3. cellular response occurs
4. termination of signal to prevent the cell from overreacting
true or false: when a receptor is activated, it goes through a
conformational change? correct answers >> true
endocrine signaling (type) correct answers >> long distance
signaling
endocrine singling (utilizes...) correct answers >> both bulk
flow and diffusion -- diffuse from cell into blood stream, travel
through blood stream through bulk flow)
endocrine signaling (example) correct answers >> steroid
hormones
paracrine signaling (type) correct answers >> short distance
signaling
paracrine signaling (utilizes...) correct answers >> diffusion
ANSWERS 2025
homeostasis correct answers >> process by which organisms
maintain a relatively stable internal environment
What do homeostatic systems do? correct answers >> act
quickly to return environment to homeostasis
what are the three components of a homeostatic system?
correct answers >> -sensor
-integrator
-effector
sensor correct answers >> senses some aspect of external or
internal environment
integrator correct answers >> evaluated the incoming
sensory information and decides whether a response is needed
effector correct answers >> help restore the environment to
desired conditions
the integrator is usually ___ _____ but it can be _ _____. correct
answers >> the brain, a gland
,negative feedback correct answers >> effectors reduce or
oppose the change
the most common type of feedback is ________ correct answers
>> negative
endotherms (4) correct answers >> -produce adequate heat
to warm themselves
-body temperature stays the same
-most birds and mammals
-heat from metabolic fuel and insulation
ectotherms (4) correct answers >> -rely on heat from
environment
-body temperature changes throughout day
-most invertebrates, fish, amphibians and reptiles
-not very active in morning or at night
what are the four components of cellular communication?
correct answers >> -signaling cell
-signaling molecule
-receptor protein
-responding cell
signaling cell can be a _______, _____, or ___ correct answers
>> peptide, lipid, or gas
, briefly explaining cellular communication correct answers >>
a signaling cell is the source of a signaling molecule, which binds
to a receptor protein on or in the resounding cell which then
results in change of activity
what is the four step process once receptor is bound? correct
answers >> 1. receptor is activated by signal, causes
conformational change
2. receptor triggers signal transduction
3. cellular response occurs
4. termination of signal to prevent the cell from overreacting
true or false: when a receptor is activated, it goes through a
conformational change? correct answers >> true
endocrine signaling (type) correct answers >> long distance
signaling
endocrine singling (utilizes...) correct answers >> both bulk
flow and diffusion -- diffuse from cell into blood stream, travel
through blood stream through bulk flow)
endocrine signaling (example) correct answers >> steroid
hormones
paracrine signaling (type) correct answers >> short distance
signaling
paracrine signaling (utilizes...) correct answers >> diffusion
