Exam 3 Dr. Mon

Which of the following are involuntary muscle?

• cardiac muscle

• skeletal

  muscle

• smooth muscle

• both smooth and cardiac muscle

_____ channels use chemical messengers like hormones and neurotransmitters to open and close.

• voltage-gated channels

• leak channels

• ligand-gated channels

• mechanically-gated channels

Electrical equilibrium can be maintained by repulsion of Na+ due to the accumulation of positive charge inside the cell.

• True

• False

Tags

NGSS.HS-LS1-3

What event is this: Na+ influx, membrane turns more positive

• resting state

• hyperpolarization

• repolarization

• depolarization

Ion concentrations are regulated homeostatically, so equilibrium potentials should change often.

• True

• False

Tags

NGSS.HS-LS1-3

resting membrane potential voltage ranges from:

• -50 mV to 90 mV

• +30 mV to +50 mV

• -10 mV to +10 mV

• 0 mV to +10 mV

Identify: cell body, contains nucleus

• dendrites

• soma

• axon

• axon terminal

Na+ _____ the cell passively via channels. There is a ____ concentration of Na+ inside the cell than outside.

• exits; lower

• enters; lower

• exits; higher

• enters; higher

Tags

NGSS.HS-LS1-3

What event is this: too much K+ is let out, membrane turns more negative

• resting state

• hyperpolarization

• repolarization

• depolarization

Identify: AKA "trigger zone" where action potantial is generated

• dendrites

• soma

• axon hillock

• axon terminal