Week 3 Lecture Quizzes

The average threshold (electrical charge) for an action potential to occur in a neuron is a. -90 mv b. - 70 mv c. - 55 mv d. 0 m

-55

the usual electrical charge in a resting neuron is a. 90 mv ‒ b. - 70 mv c. - 55 mv d. 0 m

-70

The movement of which ion is responsible for repolarization of a charged cell which has had an action potential? a. Na+ sodium b. Cl - chlorine c. phosphates - d. K+ potassium

K+ potassium

Which of the following cations can diffuse passively in and out of the cell, but is in greater concentration outside the cell during RMP resting membrane potential? a. Na+ sodium b. Cl- chlorine c. phosphates - d. K+ potassium

Na+

What process of active cell transport has the largest effect on maintaining the charges in RMP resting membrane potential? a. lysosome exocytosis c. glucose co-transport b. passive Na+ diffusion d. Na+/K+ sodium/potassium pump

Sodium/potassium pump

Which of the following spinal nerve structures carries efferent motor impulses from the spinal cord out to the body? a. anterior (ventral) root b. posterior (dorsal) root c. cauda equine d. cranial nerve

anterior (ventral) root

Which of the three rami (branches) of the spinal nerve provides innervation to the nerve plexi (plexuses)? a. posterior branch b. meningeal branch c. anterior branch d. communicating branch

anterior branch

Which neuroglial cell in the CNS central nervous system has foot-like extensions which help form a blood-brain barrier with small blood vessels? a. astrocytes b. ependymal cells c. Schwann cells d. microglia

astrocytes

The term for neuron tracts crossing in the spinal cord is a. ipsilateral b. contralateral c. ascending d. decussation

decussation

the part of a neuron which receives stimuli from the internal or external environment is the a. dendrites b. axon terminal c. neurosoma d. axon hillock

dendrites

The term describing nervous impulses leaving the CNS central nervous system to go to the PNS peripheral nervous system is a. afferent b. efferent c. autonomic d. involuntary

efferent

What is the name of the loose connective tissue which surrounds the individual nerve cell's neurilemma (cell membrane)? a. endoneurium b. epineurium c. perineurium d. meninges

endoneurium

The name for a thick sheet of connective tissue on or between entire muscle organs is a. epimysium b. perimysium c. endomysium d. fascia

fascia

The description of a tear in a muscle, containing structures from another body cavity, is a a. sprain b. luxation c. hernia d. dislocation

hernia

A muscle which is entirely contained within its area of motion is called a(n) ___________ muscle. a. extrinsic b. intrinsic c. prime mover d. compartment

intrinsic

The term for damage to a tissue due to loss of blood supply is a. ischemia b. necrosis c. gangrene d. sclerosis

ischemia

What makes the grey matter of the spinal cord or brain appear grey? a. neuron cell bodies b. cerebrospinal fluid c. myelinated axon fibers d. fibrous connective tissue

neuron cell bodies

What is the meningeal layer which is thinnest and adhered to the spinal cord itself? a. dura mater b. arachnoid mater c. pia mater d. periosteum

pia mater

Conduction speed along neuron axons is determined by axon diameter, and ______________. a. location of the neuron in the body c. type of neurotransmitter b. presence or absence of a myelin sheath d. direction of the impulse

presence or absence of a myelin sheath

the large muscle which creates the patellar tendon is the a. biceps femoris b. semitendinosus c. gastrocnemius d. quadricep

quadricep

sleeve-like sheet of tissue which contains tendons crossing the carpus or tarsus is a a. bursa b. retinaculum c. compartment d. meniscu

retinaculum

Which nerve plexus provides nerve supply to the legs? a. cervical plexus b. brachial plexus c. lumbar plexus d. sacral plexus

sacral plexus

The name for a circular skeletal muscle which controls the flow through a tubular structure is called a a. stabilizer b. sphincter c. synergist d. dilator

sphincter

The ascending tract in the spinal cord which carries sensory information from the body to the cerebellum is the a. cuneate fasciculus c. spinothalamic tract b. gracile fasciculus d. spinocerebellar tract

spinocerebellar tract

Which type of reflex causes the knee joint to extend when the patellar tendon is tapped? a. tendon reflex b. stretch reflex c. flexor (withdrawal) reflex d. crossed extension reflex

stretch reflex

A muscle which assists the prime mover muscle in flexing a joint is called a(n) a. agonist b. antagonist c. synergist d. fixator

synergist

The name of the fibrous connective tissue which connects muscle to bone is a. tendon b. ligament c. retinaculum d. cartilage

tendon

The descending tract in the spinal cord which carries motor signals from the balance organ in the inner ear to effectors such as muscles in the body is the a. corticospinal tract b. tectospinal tract c. reticulospinal tract d. vestibulospinal tract

vestibulospinal tract

The division of the nervous system which sends messages out from the central nervous system to internal organs and glands is the a. Somatic sensory nervous system b. Somatic motor nervous system c. Visceral sensory nervous system d. Visceral motor nervous system

visceral motor nervous system