This is a timed quiz.
You have 10 minutes to complete the 10 questions in this quiz.
1) Characters of Local potential:
A) Cannot be graded.
B) Followed by ARP
C) Associated with decremental conduction.
D) Cannot be summated.
2) Alactic oxygen debt:
A) Uses greater amount of O2
B) Used to replenish ATP stores
C) Takes 1 hour or more
D) All of the above
3) Moderate training, long duration swimming:
A) Increase number of capillaries.
B) Increase myoglobin.
C) Increase number of mitochondria.
D) All of the above.
4) Isotonic Contraction:
A) Tension is constant.
B) Muscle length decreases.
C) Mechanical efficiency is Zero.
D) A + B.
5) Smooth muscle Contraction:
A) Needs Calmodulin.
B) Has Low ATPase activity
C) At first, Tension increases then decreases.
6) Nerve Excitability is increased by:
A) Hyperkalemia
B) Hypercalcemia
C) Hyponatremia
D) A + C.
7) During rest, Voltage gated Na channels:
A) m gate close, h gate close.
B) m gate close, h gate open
C) m gate open, h gate open
D) n gate open.
8) Skeletal muscle contraction:
A) Ca binds to Troponin T
B) Bending of Cross bridges donot need ATP.
C) A band shortens
D) Ca release from SR.
9) Smooth muscle contraction is enhanced by:
A) Acetyl choline
B) Progesterone
C) Norepinephrine
D) A + B
7) All are characteristics of single unit smooth muscle except:
A) Unstable RMP.
B) Spontaneous electric activity
C) Nonrhythmic
D) Obey all or None law