Unit 5 Extra Credit quiz

Which of the following is an amino acid that operates at inhibitory synapses in the brain?

GABA

What is the role of calcium in muscle contractions?

bind to the troponin complex, which leads to the exposure of the myosin-binding sites

Neurotransmitters are released from axon terminals via

exocytosis.

Which of the following could you find in the lumen of a transverse tubule?

extracellular fluid

For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in

hyperpolarization of the neuron.

The blood-brain barrier

is formed by tight junctions.

Saltatory conduction is a term applied to conduction of impulses

jumping from one node of Ranvier to the next in a myelinated neuron.

Which of the following does not form part of the thin filaments of a muscle cell?

myosin

The operation of the sodium-potassium "pump" moves

sodium ions out of the cell and potassium ions into the cell.

When several EPSPs arrive at the axon from different dendritic locations, depolarizing the postsynaptic cell to threshold for an action potential, this is an example of

spatial summation.

A sustained muscle contraction due to a lack of relaxation between successive stimuli is called

tetanus

A neuron can alter the activities of its target cells in muscles because

the target cells have receptor proteins for the signals released by the nervous system.