1
Expert solutions
BIO 2301 Exam One Questions and Answers
(100% Correct Answers) Already Graded A+
homeostasis
✓✓ a state of equilibrium, as in an organism or cell, maintained self-regulating
process
4 components of homeostatic control mechanism?
✓✓ variable, receptor, control center, effector
variable (homeostatic control center)
✓✓ some factor the body must control
control center (homeostasis)
✓✓ contains set point and directs the body's response
effector (homeostatic control center)
✓✓ carries out the response to fix/effectively change the deviated variable
receptor (homeostatic control center)
✓✓ measures/detects changes to the variable
negative feedback
✓✓ maintains homeostasis by responding to a change (with receptor)
positive feedback
✓✓ normal responses; will respond to change in a variable by causing a greater
change in the same direction
negative feedback example: AC set to 70, but it is 100 outside, when air
from outside gets in, what does AC do?
, 2
Expert solutions
✓✓ AC turns on to bring temperature back to 70
is blood clotting negative or positive feedback?
✓✓ positive
is blood pressure is high, how does body return to homeostasis?
✓✓ lower heart rate, which lowers BP
if blood glucose is low, how does body return to homeostasis?
✓✓ release a hormone (glucagon) to raise blood glucose levels
if body temp. is high, how does body return to homeostasis?
✓✓ shiver/vasoconstrict blood vessels to skin, raising body temp.
after eating something salty, blood sodium levels rise, how does the body
return to homeostasis?
✓✓ releases hormone (ANF) which causes kidneys to excrete sodium
what does the cell membrane consist of?
✓✓ protein, phospholipids, cholesterol, and carbs
polar molecules
✓✓ small charge
nonpolar molecules
✓✓ no charge
ampipathic
✓✓ molecules with nonpolar and polar regions
phospholipid
Expert solutions
BIO 2301 Exam One Questions and Answers
(100% Correct Answers) Already Graded A+
homeostasis
✓✓ a state of equilibrium, as in an organism or cell, maintained self-regulating
process
4 components of homeostatic control mechanism?
✓✓ variable, receptor, control center, effector
variable (homeostatic control center)
✓✓ some factor the body must control
control center (homeostasis)
✓✓ contains set point and directs the body's response
effector (homeostatic control center)
✓✓ carries out the response to fix/effectively change the deviated variable
receptor (homeostatic control center)
✓✓ measures/detects changes to the variable
negative feedback
✓✓ maintains homeostasis by responding to a change (with receptor)
positive feedback
✓✓ normal responses; will respond to change in a variable by causing a greater
change in the same direction
negative feedback example: AC set to 70, but it is 100 outside, when air
from outside gets in, what does AC do?
, 2
Expert solutions
✓✓ AC turns on to bring temperature back to 70
is blood clotting negative or positive feedback?
✓✓ positive
is blood pressure is high, how does body return to homeostasis?
✓✓ lower heart rate, which lowers BP
if blood glucose is low, how does body return to homeostasis?
✓✓ release a hormone (glucagon) to raise blood glucose levels
if body temp. is high, how does body return to homeostasis?
✓✓ shiver/vasoconstrict blood vessels to skin, raising body temp.
after eating something salty, blood sodium levels rise, how does the body
return to homeostasis?
✓✓ releases hormone (ANF) which causes kidneys to excrete sodium
what does the cell membrane consist of?
✓✓ protein, phospholipids, cholesterol, and carbs
polar molecules
✓✓ small charge
nonpolar molecules
✓✓ no charge
ampipathic
✓✓ molecules with nonpolar and polar regions
phospholipid
