ExPhys Ch 3: Neural Control of Exercising Muscle

Which division of the nervous system is responsible for incoming signals?

• Motor (efferent)

• Sensory (afferent)

• Central

• Autonomic

Which system includes the brain and spinal cord?

• Central nervous system

• Peripheral nervous system

• Autonomic nervous system

• Somatic nervous system

Which part of the neuron is responsible for receiving signals?

• Dendrites

• Axon

• Cell body

• Nucleus

How many Na⁺ ions are moved for each 2 K⁺ ions by the Na⁺-K⁺ pump?

• 1

• 2

• 3

• 4

Which ion leaves the cell during hyperpolarization?

• Na⁺

• Cl⁻

• K⁺

• Ca²⁺

Which of the following is true about depolarization?

• It makes the cell more negative.

• It is not required for nerve impulses.

• It involves Na⁺ entering the cell.

• It involves K⁺ leaving the cell.

Which type of potential can help decide whether to pass a signal to the axon?

• Graded potentials (GPs)

• Action potentials (APs)

• Resting potentials

• Threshold potentials

What does an inhibitory signal cause in terms of ion movement?

• Na⁺ influx

• K⁺ efflux

• Ca²⁺ influx

• Cl⁻ influx

Which refractory period allows for the possibility of Na⁺ channels reopening?

• Absolute refractory period

• Relative refractory period

• Both A and B

• Neither A nor B

What is the primary ion movement during the relative refractory period?

• Na⁺ influx

• K⁺ efflux

• Ca²⁺ influx

• Cl⁻ influx