Week 6 lecture test PHYs 261
questions with verified answers
In power stroke, ATP binds to the myosin at the beginning of muscle contraction causing the
myosin head to - correct answer ✔✔ release actin.
immediately after the power stroke is the - correct answer ✔✔ release of ADP from myosin
The action potential traveling along the t-tubule changes the conformation of the - correct
answer ✔✔ dihydropyridine (DHP) receptor (L-type calcium channel).
The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of
a - correct answer ✔✔ channel for both Na+ and K+.
Each myosin head has binding site for - correct answer ✔✔ actin and ATP
The contraction cycle is initiated by the rise in - correct answer ✔✔ calcium
Hydrolysis of ATP cause myosin to - correct answer ✔✔ rotate into a cocked to bind to actin
ADP cause - correct answer ✔✔ release of myosin head
Crossbridge - correct answer ✔✔ the space between actin and myosin molecules where the
thick and thin filaments connect.
Target site for reflex are - correct answer ✔✔ muscle and gland
, Polysynaptic reflex has - correct answer ✔✔ two synapse and three neurons
Brain stem control these reflexes: salivating, vomiting, sneezing, swallowing - correct answer
✔✔ but not URINATION
False about autonomic reflexes is - correct answer ✔✔ autonomic reflexes are all monosynaptic
with their synapse in the CNS. (they are not all monosynaptic)
Sensory fiber of muscle spindle target - correct answer ✔✔ Golgi tendon organs
Prevent damage from overstretching is - correct answer ✔✔ Stretch reflex
Flexion reflex - correct answer ✔✔ moves a limb away from painful stimulus
Bump off the curve is - correct answer ✔✔ crossed extensor reflex
crossed extensor reflexes is - correct answer ✔✔ the withdrawal reflexes that make
compensatory adjustment on opposite side that stimulus is felt.
Golgi tendon organs - correct answer ✔✔ sometimes inhibited motor neuron
Most reflex arcs integrated by - correct answer ✔✔ spinal cord
Many reflexes are regulated by - correct answer ✔✔ negative feedback
questions with verified answers
In power stroke, ATP binds to the myosin at the beginning of muscle contraction causing the
myosin head to - correct answer ✔✔ release actin.
immediately after the power stroke is the - correct answer ✔✔ release of ADP from myosin
The action potential traveling along the t-tubule changes the conformation of the - correct
answer ✔✔ dihydropyridine (DHP) receptor (L-type calcium channel).
The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of
a - correct answer ✔✔ channel for both Na+ and K+.
Each myosin head has binding site for - correct answer ✔✔ actin and ATP
The contraction cycle is initiated by the rise in - correct answer ✔✔ calcium
Hydrolysis of ATP cause myosin to - correct answer ✔✔ rotate into a cocked to bind to actin
ADP cause - correct answer ✔✔ release of myosin head
Crossbridge - correct answer ✔✔ the space between actin and myosin molecules where the
thick and thin filaments connect.
Target site for reflex are - correct answer ✔✔ muscle and gland
, Polysynaptic reflex has - correct answer ✔✔ two synapse and three neurons
Brain stem control these reflexes: salivating, vomiting, sneezing, swallowing - correct answer
✔✔ but not URINATION
False about autonomic reflexes is - correct answer ✔✔ autonomic reflexes are all monosynaptic
with their synapse in the CNS. (they are not all monosynaptic)
Sensory fiber of muscle spindle target - correct answer ✔✔ Golgi tendon organs
Prevent damage from overstretching is - correct answer ✔✔ Stretch reflex
Flexion reflex - correct answer ✔✔ moves a limb away from painful stimulus
Bump off the curve is - correct answer ✔✔ crossed extensor reflex
crossed extensor reflexes is - correct answer ✔✔ the withdrawal reflexes that make
compensatory adjustment on opposite side that stimulus is felt.
Golgi tendon organs - correct answer ✔✔ sometimes inhibited motor neuron
Most reflex arcs integrated by - correct answer ✔✔ spinal cord
Many reflexes are regulated by - correct answer ✔✔ negative feedback
