Areas of gray matter in the spinal cord are called

• horns

• astrocytes

• ependymal cells

• tracts

depolarization of the nerve membrane begins with..........

• decreased permeability of K+ ions

• decreased permeability of Na+ ions

• increased permeability of Na+ ions

• increased permeability of K+ ions

neurons that detect stimuli in the environment are known as.......

• stimulants

• receptors

• synapses

• axons

The middle layer of the meninges?

• dura matter

• cortex

• pia matter

• arachnoid matter

The motor root of the spinal cord is the ___________ root.

• posterior or dorsal

• superior or dorsal

• anterior or ventral

• inferior or ventral

Somatic nervous system innervates the skeletal system and is ?

• paralyzed

• limp

• voluntary

• involuntary

The term that refers to groups of myelinated axons from many neurons supported by neuroglia is ........

• Nissl bodies

• white matter

• gray matter

• horns

Transmission of nerve impulses across the synapses is brought about by the secretions of very low concentrations of the chemicals known as........

• dopamine

• neurotransmitters

• endorphins

• chromatids

Which of the following is true of resting membrane potential?

• Membrane permeability to Na+ ions changes.

• Resting membrane potential is maintained by the sodium-potassium pump.

• Membrane potential changes from negative to positive inside the cell

• Na+ ions rush into the cell

The part of the brain that relays messages between the brain and the spinal cord and controls involuntary functions in the respiratory, digestive and pulmonary systems.

• Midbrain

• Pons

• Medulla oblongata

• cerebrum