Chorionic villus sampling (CVS) may be performed early in pregnancy to find certain problems with the fetus. Determine and describe the extraembryonic membrane that is being sampled
What will be an ideal response?
The chorion, an extraembryonic membrane, forms outgrowths called chorionic villi—the membrane being sampled. As the pregnancy progresses, chorionic villi grow only in the direction of the stratum functionalis layer of the endometrium. By late week four of development, the chorionic villi are blended with the stratum functionalis layer and begin to form the principal embryonic part of the placenta. Since this layer is created from the embryonic cells, those cells can be used to determine genetic abnormalities that will also be present in the embryo/fetus.
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Which muscle extends the forearm?
A) coracobrachialis B) biceps brachii C) brachialis D) brachioradialis E) triceps brachii
Which of the following is a correct listing of the cranial nerves that originate from the medulla oblongata?
A) glossopharyngeal, vagus, accessory, and olfactory B) glossopharyngeal, vagus, accessory, and hypoglossal C) glossopharyngeal, vagus, trochlear, and oculomotor D) glossopharyngeal, trigeminal, accessory, and abducens
The brachial vein ________
A) drains blood from the radial and ulnar veins, then empties that blood into the axillary vein B) drains blood from the internal jugular vein, then empties that blood into the superior vena cava C) drains blood from the popliteal vein, then empties that blood into the external iliac vein D) drains blood from the axillary vein, then empties that blood into the superior vena cava E) drains blood from the popliteal vein, then empties that blood into the femoral vein
Which of the following is true regarding the difference between the mucosa of the small and large intestines?
A) The small intestine has deeper intestinal crypts than the large intestine. B) Intestinal crypts are only found in the large intestine. C) The large intestine has larger circular folds than the small intestine. D) They both have villi, but only the small intestine has microvilli. E) The small intestine has simple columnar epithelium and the large intestine does not.