Which of the following completely encloses the embryo and provides it with a stable environment?
A. Yolk sac
B. Amnion
C. Chorion
D. Chorionic villus
E. Allantois
B. Amnion
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Answer the following statements true (T) or false (F)
1. Acquired reflexes develop following repeated exposure to a stimulus. 2. Visceral reflexes maintain normal upright posture. 3. The patellar reflex is also known as the "knee jerk" reflex. 4. Stretch reflexes provide automatic regulation of skeletal muscle length.
What type of endoplasmic reticulum (ER) is made of tubules and lumens?
a. long ER b. smooth ER c. rough ER d. Golgi complex e. short ER
The innermost layer of the alimentary canal is called the tunica ____
a. submucosa b. mucosa c. serosa d. adventitia
The large surface area of the inside of the small intestine means that this structure is
?A. well adapted for its physiological role in absorption.?B. derived from an embryological structure that served a different function.?C. anatomically complex but physiologically simple.?D. maladaptive in that it harbors bacteria.