During embryonic development, the conducting portion of the respiratory system develops by the ________ week.
A. 16th
B. 4th
C. 10th
D. 12th
E. 6th
Answer: A
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The steps in the process of endochondral ossification area: Ossification center forms in the diaphysis.b: Cartilage calcifies and a bone collar forms.c: Ossification centers form in the epiphyses.d: Bone replaces cartilage.e: Epiphyseal plates ossify.f: Cartilage model develops.The correct chronological order for these steps is
A. b. - c. - f. - a. - e. - d. B. f. - b. - a. - c. - d. - e. C. a. - e. - c. - d. - b. - f. D. f. - b. - c. - d. - a. - e. E. a. - c. - b. - d. - e. - f.
Label component "D" of the reflex arc.
A. Motor neuron B. Sensory receptor C. Sensory neuron D. Effector organ E. Interneuron
G cells of the stomach secrete
A) cholecystokinin. B) secretin. C) gastrin. D) enteropeptidase. E) pepsin.
Which of the following is responsible for secondary sex characteristics in females?
A) estrogens B) progesterone C) follicle-stimulating hormone (FSH) D) human chorionic gonadotropin (hCG) E) testosterone