Muscle and Nervous Tissues

Question 1

Striations

Answer 1

alternating light and dark bands within fibers that are visible under a light microscope.

Question 1

Intercalated discs

Answer 1

identifying features of cardiac muscle that contain desmosomes and gap junctions. they connect heart muscle cells.

Question 2

Dendrite

Answer 2

tapering, highly branched, and usually short cell processes. they are the major receiving or input portion of a neuron.

Question 3

Axon

Answer 3

a single, thin, cylindrical process that may be very long. it is the output portion of neuron, conducting nerve impulses toward another neuron or to some other tissue.

Question 4

Neuroglia

Answer 4

supporting cells.

Question 5

Skeletal muscle tissue

Answer 5

long, cylindrical, striated fibers. skeletal muscle is voluntary because it can be made to. contract or relax by conscious control.
Location: usually attached to the bones by tendons.
Function: motion, posture, heat production, protection.

Question 6

Cardiac muscle tissue

Answer 6

branched, striated fibers with usually only one centrally located nucleus. connected with intercalated discs. (involuntary muscle)
Location: heart wall
Function: pumps blood to all parts of body.

Question 7

Smooth muscle tissue

Answer 7

(involuntary) non-striated (smooth) small spindle-shaped cell thickest in the middle tapering at each end.
location: iris of eyes, walls of hollow internal structures, such as blood vessels, airways to lungs, stomach, intestines, gallbladder, urinary bladder, and uterus.
function: motion (constriction of blood vessels, and airways, propulsion of foods through the gastrointestinal tract, contraction of urinary bladder and gallbladder.)

Question 8

Nervous tissue

Answer 8

consists of only 2 types of cells: neurons and neuroglia.
Location: nervous system
Function: exhibits sensitivity to various types of stimuli: converts stimuli into nerve impulses (action potentials); conducts nerve impulses to other neurons, muscle fibers, or glands.

Question 9

neurons

Answer 9

nerve cells - are sensitive to various stimuli. They convert stimuli into electrical signals called nerve action potentials and conduct these action potentials to other neurons, to muscle tissue, or to glands.