M-words

Question 1

maximal ejection

Answer 1

the part of the heart cycle following the opening of the semilunar valves durig systole

Question 2

mean electrical axis

Answer 2

direction of the electrical vector of the heart at the peak of the R-wave

Question 3

memory cell

Answer 3

lymphocyte specialized for the long-term storage of the code to synthesize an antibody

Question 4

metarteriole

Answer 4

vessel connecting arterioles and venules from which true capillaries originate

Question 5

microvilli

Answer 5

microscopic cellular membrane protrusions that increase the surface area of some epithelial cells

Question 6

miniature end-plate potential

Answer 6

are the small depolarizations of the postsynaptic terminal caused by the release of a single vesicle into the synaptic cleft

Question 7

mitral valve

Answer 7

bicuspid valve between the left atrium and ventricle

Question 8

monocyte

Answer 8

large WBC with phagocyte function

Question 9

monosaccharide

Answer 9

simple sugar (ribose, glucose, fructose)

Question 10

multipolar neuron

Answer 10

nerve cell with many processes, most neurons are like this

Question 11

muscarinic acetylcholine receptor

Answer 11

ACh receptor at which muscarine mimics the effect of acetylcholine

Question 12

muscle twitch

Answer 12

contraction and relaxation of a muscle caused by a single action potential

Question 13

myelin sheet

Answer 13

layer of Schwann cells or obligodendrocytes wrapped around the axon in 50-100 layers of membrane

Question 14

myofibril

Answer 14

a longitudinal unit of a muscle fiber, made up of sarcomeres and surrounded by sarcoplasmic reticulum

Question 15

myoglobin

Answer 15

iron-containing oxygen-binding protein molecule in the muscles resembling hemoglobin