APHY 201 EXAM 3 REVIEW CH. 12,14,15 QUESTIONS
WITH VERIFIED ANSWERS
About heart muscle - Answers - is not easily fatigued
Purpose of transverse tubules - Answers - ensure a supply of Ca2+ ions through the
muscle fiber and rapidly conduct action potentials to the interior of the muscle fiber
Striated muscles - repeating unit of the banding pattern tension generated in a muscle
fiber is directly proportional to the power stroke time between the end of the action
potential in the muscle and the beginning of contraction - Answers - sarcomere
Muscle fatigue arises primarily from failure in - Answers - excitation-contraction cycle
Muscle fatigue is known to be associated mainly with - Answers - depletion of glycogen
stores
A contraction that generates force and moves a load is known as ________, whereas
one that generates force without movement is known as _______ . - Answers - isotonic,
isometric
Put these events in the correct chronological sequence: End-plate potential trigger
action potentials;Transverse tubules convey potential into the interior of the
cell;Acetylcholine binds to receptors on the motor end plate; Binding sites on actin are
uncovered, allowing myosin to bind and carry out power strokes; Ca2+ is released from
the sarcoplasmic reticulum; Chemically regulated ion channels open, causing
depolarization; Ca2+ ions bind to troponin -C, pulling on tropomyosin - Answers - -
Acetylcholine binds to receptors on the motor end plate.
-Chemically regulated ion channels open causing depolarization.
-End-plate potentials trigger action potentials.
-Transverse tubules convey potentials into the interior of the cell.
-Ca2+ is released from the sarcoplasmic reticulum.
-Ca2+ ions bind to troponin-C pulling on tropomyosin.
-Binding sites on actin are uncovered allowing myosin to bind
After death, when metabolism stops, in which step of the contractile cycle will skeletal
muscles remain stuck, for most of the first day or so - Answers - The rigor state
Purpose of valves in the cardiovascular system - Answers - Allows blood to flow in only
one direction through the heart chambers (from the atria through the ventricles)
WITH VERIFIED ANSWERS
About heart muscle - Answers - is not easily fatigued
Purpose of transverse tubules - Answers - ensure a supply of Ca2+ ions through the
muscle fiber and rapidly conduct action potentials to the interior of the muscle fiber
Striated muscles - repeating unit of the banding pattern tension generated in a muscle
fiber is directly proportional to the power stroke time between the end of the action
potential in the muscle and the beginning of contraction - Answers - sarcomere
Muscle fatigue arises primarily from failure in - Answers - excitation-contraction cycle
Muscle fatigue is known to be associated mainly with - Answers - depletion of glycogen
stores
A contraction that generates force and moves a load is known as ________, whereas
one that generates force without movement is known as _______ . - Answers - isotonic,
isometric
Put these events in the correct chronological sequence: End-plate potential trigger
action potentials;Transverse tubules convey potential into the interior of the
cell;Acetylcholine binds to receptors on the motor end plate; Binding sites on actin are
uncovered, allowing myosin to bind and carry out power strokes; Ca2+ is released from
the sarcoplasmic reticulum; Chemically regulated ion channels open, causing
depolarization; Ca2+ ions bind to troponin -C, pulling on tropomyosin - Answers - -
Acetylcholine binds to receptors on the motor end plate.
-Chemically regulated ion channels open causing depolarization.
-End-plate potentials trigger action potentials.
-Transverse tubules convey potentials into the interior of the cell.
-Ca2+ is released from the sarcoplasmic reticulum.
-Ca2+ ions bind to troponin-C pulling on tropomyosin.
-Binding sites on actin are uncovered allowing myosin to bind
After death, when metabolism stops, in which step of the contractile cycle will skeletal
muscles remain stuck, for most of the first day or so - Answers - The rigor state
Purpose of valves in the cardiovascular system - Answers - Allows blood to flow in only
one direction through the heart chambers (from the atria through the ventricles)
