Peristalsis only occurs in the esophagus. a) is a condition wherein the lining of the digestive tract is irritated by the passage of rough fibrous material. b) is waves of muscular contractions that move along the length of the digestive tract. c) is a muscular movement pattern that occurs in regions of the digestive tract where the smooth muscle fibers are not arranged in layers.

b) is waves of muscular contractions that move along the length of the digestive tract.

Explanation:

a) is not right, since the movement is triggered by a signal sent to the brain, which coordinates the movements.

c) is not right, since the esophagus smooth muscle is arranged in circular and longitudinal muscle layers.

NOTE: the peristalsis do not only ocurrs in the esophagus. It also occurs in all the digestive tract, as well as in the bile conducts and also in the urinary system, to conduct the urine from the kidneys to the bladder.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

i know can you plzz me with this question im sorry i didt answer your question i just need hel.