phys lab quiz 3 kill me please i hate this class so much

The region of a neuron with voltage gated sodium channels is the: a. axon hillock b. soma c. dendrite

a. axon hillock

The receptor that detects the stretch in a stretch reflex is called a(n)? a. muscle spindle b. mitotic spindle c. capsule receptor

a. muscle spindle

Which of the following defines node of Ranvier? a. spaces between segments of the myelin sheath b. small potential space that contains serous fluid, c. tissue that contains ground substance as its dominant component

a. spaces between segments of the myelin sheat

What's the function of the myelin sheath? a. speeds up the conduction of neuronal action potentials along an axon b. generates neuronal action potentials along an axon c. prevents depolarization in the synaptic cleft.

a. speeds up the conduction of neuronal action potentials along an axon

Which of the following statements defines sarcoplasmic reticulum? a. an extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils b. a modified smooth endoplasmic reticulum that wraps around the myofibrils and stores Calcium ions c. dome shaped muscle located between the thoracic and abdominopelvic cavities.

b. a modified smooth endoplasmic reticulum that wraps around the myofibrils and stores Calcium ions

What is the definition of T tubule? a. flat articular surfaces that allow gliding motion b. an extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils c. flat cell, flat nucleus

b. an extension of the sarcolemma that dives into the muscle fiber and surrounds myofibrils

The rods are responsible for _______ whereas the cones are responsible for _________ a. high acuity and dim light vision; peripheral and color vision b. peripheral and dim vision; high-acuity and color vision c. peripheral and color vision; high acuity and dim light vision

b. peripheral and dim vision; high-acuity and color vision

Which of the following accurately describes Myelin Sheath? a. connective tissue consisting of erythrocytes and leukocytes an an extracellular matrix called plasma b. fluid filled space at a synapse through which neurotransmitters diffuse c. a fatty sheath found around certain axons that increase the speed of conduction of a nerve impulse.

c. a fatty sheath found around certain axons that increase the speed of conduction of a nerve impulse.

Which of the following defines dendrite? a. hairlike extensions from the plasma membrane that propel substances past the cell b. cell that's taller than it is wide c. branching process of the neuron that carries information toward the cell body

c. branching process of the neuron that carries information toward the cell body

You would expect the error of localization and the 2 point discrimination threshold to be the *LOWEST* on the: a. thigh b. back c. fingertip

c. fingertip