2.1.3

In what order do the structures in a simple reflex arc carry a nerve impulse?

• sensory neuron, spinal cord, motor neuron, effector

• motor neuron, spinal cord, sensory neuron, effector

• brain, Spinal Cord, motor neuron, sensory neuron, effector

• effector, Motor Neuron, spinal cord, sensory neuron

Which statement BEST describes the events occurring during a patellar tendon “knee jerk” reflex?

• Relaxation of the quadriceps muscle and flexion of the leg (lower leg moves posterior)

• Contraction and relaxation of the hamstring muscle while the leg is straight

• Contraction of the hamstring muscle and flexion of the leg (lower leg moves posterior)

• Contraction of the quadriceps muscle and extension of the leg (lower leg moves anterior)

Which statement BEST describes the location of Na+ and K+ in relation to the resting neuron cell membrane?

• The amount of Na+ and K+ on the outside of the cell membrane is the same

• The amount of Na+ and K+ on the inside of the cell membrane is the same

• There is more K+ on the outside of the cell membrane and more Na+ on the inside of the cell membrane

• There is more Na+ on the outside of the cell membrane and more K+ on the inside of the cell membrane

Which is the correct order of events in a passing of the nerve impulse across a synapse? Drag the statements into their correct order from beginning to end.

• neurotransmitters are released into the synaptic cleft

• nerve impulse reaches the axon end bulb

• synaptic vesicles move to synaptic cleft

• neurotransmitters bind to receptors on postsynaptic neuron

• receptors open allowing Na+ to enter into the cell

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS4-1

During the depolarization phase of an action potential, which of the following situations exists?

• the inside of the membrane is becoming more negative with respect to the outside.

• the inside of the membrane is becoming more positive with respect to the outside

• the membrane is becoming less permeable to all ions.

• the membrane potential remains constant

During the re-polarization phase of an action potential, which of the following is the primary activity?

• potassium ions are flowing into the cell

• potassium ions are flowing out of the cell

• sodium ions are flowing into the cell

• sodium ions are flowing out of the cell

During the depolarization phase of an action potential, which of the following is the primary activity?

• potassium ions are flowing into the cell

• potassium ions are flowing out of the

• sodium ions are flowing into the cell

• sodium ions are flowing out of the cell

What is the name given to the specific value of -55 mV that starts an action potential?

• Stimulus potential

• Starter stimulus

• Hyperpolarizing stimulus

• Threshold stimulus

What is occurring during the hyperpolarizing phase of an action potential?

• The inside of the neuron is becoming more negative due to excess K+ leaving the cell

• The inside of the neuron is becoming more negative due to excess Na+ leaving the cell

• The inside of the neuron is becoming more positive due to excess K+ leaving the cell

• The inside of the neuron is becoming more positive due to excess Na+ leaving the cell