WCU PHYS 261 WEEK 1 QUIZ CH 1 2 EXAM
2026 QUESTIONS WITH ANSWERS
ALREADY GRADED A+
⩥ Homeostasis. Answer: The maintenance of relatively constant internal
environment. Quickly restores changed conditions back to normal.
⩥ Placebo. Answer: Inactive substance
⩥ Cations. Answer: Positively Charged Ions (Ion: a atom that has gained
a +/- charge)
⩥ Isotopes. Answer: An element that has a different # of neutrons
(neutron: a neutral particle found inside the nucleus of an atom)
⩥ Active Cellular Transport. Answer: Active transport moves molecules
against their concentration gradient and requires an outside source of
energy. In primary (direct) active transport, the energy comes directly
from ATP. Secondary (indirect) active transport uses the potential energy
stored in a concentration gradient and is indirectly driven by
energy from ATP.
The most important primary active transporter is the sodium-potassium
ATPase (Na+ -K+ -ATPase), which pumps NA+ out of the cell and K+
into the cell the
, ratio is 2:3.
Most secondary active transport systems are driven by the sodium
concentration
gradient.
⩥ Refractory Period. Answer: During which a second action potential
cannot be triggered, no matter how large the stimulus. Because of this,
action potentials cannot be summed.
⩥ Isotonic vs Isometric Muscle Contraction. Answer: An isotonic
contraction shortens creates force and moves a load. An isometric
contraction does not shorten does not reach treshold, creates force
without moving a load.
IsoMountain: No
⩥ Intercalated Disc. Answer: Myocardial cells are linked to one another
by intercalated disks that contain gap junctions. The junctions allow
depolarization to spread rapidly from cell to cell.
⩥ MI - Myocardial Infarction. Answer: physiology involves the death of
heart muscle tissue due to prolonged ischemia—a critical lack of blood
flow and oxygen, typically caused by a blood clot blocking one of the
coronary arteries
2026 QUESTIONS WITH ANSWERS
ALREADY GRADED A+
⩥ Homeostasis. Answer: The maintenance of relatively constant internal
environment. Quickly restores changed conditions back to normal.
⩥ Placebo. Answer: Inactive substance
⩥ Cations. Answer: Positively Charged Ions (Ion: a atom that has gained
a +/- charge)
⩥ Isotopes. Answer: An element that has a different # of neutrons
(neutron: a neutral particle found inside the nucleus of an atom)
⩥ Active Cellular Transport. Answer: Active transport moves molecules
against their concentration gradient and requires an outside source of
energy. In primary (direct) active transport, the energy comes directly
from ATP. Secondary (indirect) active transport uses the potential energy
stored in a concentration gradient and is indirectly driven by
energy from ATP.
The most important primary active transporter is the sodium-potassium
ATPase (Na+ -K+ -ATPase), which pumps NA+ out of the cell and K+
into the cell the
, ratio is 2:3.
Most secondary active transport systems are driven by the sodium
concentration
gradient.
⩥ Refractory Period. Answer: During which a second action potential
cannot be triggered, no matter how large the stimulus. Because of this,
action potentials cannot be summed.
⩥ Isotonic vs Isometric Muscle Contraction. Answer: An isotonic
contraction shortens creates force and moves a load. An isometric
contraction does not shorten does not reach treshold, creates force
without moving a load.
IsoMountain: No
⩥ Intercalated Disc. Answer: Myocardial cells are linked to one another
by intercalated disks that contain gap junctions. The junctions allow
depolarization to spread rapidly from cell to cell.
⩥ MI - Myocardial Infarction. Answer: physiology involves the death of
heart muscle tissue due to prolonged ischemia—a critical lack of blood
flow and oxygen, typically caused by a blood clot blocking one of the
coronary arteries
