Physiology Review Q's Flashcards
PHYSIO Lectures: 1. Mechanism of Muscle Contraction (1-24) 2. Excitation-Contraction coupling (25-41) 3. Neuromuscular Junction (42-67) PHYSIO PRACTICALS: 1. TS: Muscle twitch (68-74) 2. Nerve Conduction Velocity (75-77)
Which of the following is a dark band?
a. I band
b. A band
a. I band
Which of the following has high ATPase activity?
a. fast-twitch muscles
b. slow-twitch muscles
a. fast-twitch muscles
Which of the following has lots of mitochondria?
a. fast-twitch muscles
b. slow-twitch muscles
b. slow-twitch muscles
Which of the following has a larger diameter?
a. fast-twitch muscles
b. slow-twitch muscles
a. fast-twitch muscles
Which of the following is stronger?
a. fast-twitch muscles
b. slow-twitch muscles
a. fast-twitch muscles
Which of the following has a high amount of oxidative enzymes?
a. fast-twitch muscles
b. slow-twitch muscles
b. slow-twitch muscles
Which of the following appears red?
a. fast-twitch muscles
b. slow-twitch muscles
b. slow-twitch muscles
Which of the following has a high amount of glycolytic enzymes?
a. fast-twitch muscles
b. slow-twitch muscles
a. fast-twitch muscles
What best describes the function of T tubules?
a. store Ca
b. plasma membrane
c. help action potential go to deep muscle
d. supply the energy needed for contraction
e. connects actin and myosin filaments elastically
c. help action potential go to deep muscle
Which is used to view a muscle fiber?
a. regular microscope
b. electron microscope
a. regular microscope
What best describes the function of titin?
a. store Ca
b. plasma membrane
c. help action potential go to deep muscle
d. supply the energy needed for contraction
e. connects actin and myosin filaments elastically
e. connects actin and myosin filaments elastically
T/F: the organization of myosin and actin must be constant in a healthy muscle
false; different organizations of myosin and actin occur based on location
Which is used to view a myofibril?
a. regular microscope
b. electron microscope
b. electron microscope
Which of the following has both actin and myosin?
a. I band
b. H zone
c. A band
d. Z line
c. A band
Which of the following only has actin?
a. I band
b. H zone
c. A band
d. Z line
a. I band
Which stops ATPase activity?
a. TnC
b. TnI
c. TnT
b. TnI
Which of the following only has myosin?
a. I band
b. H zone
c. A band
d. Z line
b. H zone
Which regulates the interaction between troponin complex and thin filaments?
a. TnC
b. TnI
c. TnT
c. TnT
Which marks the border of one sarcomere?
a. I band
b. H zone
c. A band
d. Z line
d. Z line
When does the myosin head move the actin forward?
a. when the ATP binds
b. when the ATP is hydrolyzed
c. when the ADP is released
c. when the ADP is released
A medical student tries and fails to lift his 50Kg backbag from the ground. What type of contraction is this an example of?
a. isometric
b. isotonic
a. isometric
Describe the relationship between actin-myosin overlap and contraction force?
a. directly proportional
b. inversely proportional
a. directly proportional
Walking is what type of contraction?
a. isometric
b. isotonic
b. isotonic
Describe the relationship between the velocity of contraction and the muscle load?
a. directly proportional
b. inversely proportional
b. inversely proportional
Which of the following cells have a resting potential of zero?
a. muscle cells
b. neurons
c. dead cells
c. dead cells
Which of the following molecules have no leak channels?
a. K+
b. Na+
b. Na+
What is used to counter the high potassium concentration in the cell?
negatively charged chloride ions and negatively charged proteins
Which of the following plays the biggest role in resting potential?
a. K+ potential
b. Na+ potential
c. Cl- potential
a. K+ potential
How do action potentials translate information?
a. amplitude
b. frequency
b. frequency
What determines the maximum frequency of a cell?
a. failed initiations
b. threshold
c. refractory period
d. resting state
c. refractory period