A 27-year-old woman comes to the hospital in the early stages of labor. She is 37 weeks pregnant in her first pregnancy, which has been normal. She has no notable past medical history, does not smoke or drink, and is not taking any medications. The examination in the labor and delivery unit is normal, and all appears well with the fetus. At this time, which of the following fetal vessels is carrying the highest concentration of oxygen?
(A) Abdominal aorta
(B) Umbilical arteries
(C) Pulmonary artery
(D) Umbilical vein
(E) Pulmonary veins
Ans: (D) Umbilical vein
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Answer the following statements true (T) or false (F)
1. Artificial passive immunity can be effective even after a person has been exposed to the infectious organism. 2. The surface protein on a cancer cell or a microorganism can be an antigen. 3. An antibody and an antigen fit together like a key in a lock. 4. Antigens have the ability to neutralize specific toxins in the body. 5. When an antigen and an antibody unite, macrophages can destroy the antigen more efficiently.
Which is not correct regarding nephrons?
A. The renal corpuscle may be located in the renal cortex or renal medulla. B. The nephron is the functional filtration unit in the kidney. C. The renal tubule is composed of the proximal convoluted tubule, nephron loop, and distal convoluted tubule. D. The renal corpuscle includes the glomerulus and the glomerular capsule. E. Eighty-five percent of nephrons are cortical nephrons.
Which part of the spinal cord contains somas of somatic motor neurons?
A. The anterior horns B. The lateral horns C. The spinothalamic tract D. The posterior horns E. The arachnoid
The pancreas belongs to the endocrine system, and is an accessory organ of this organ system
A) digestive B) lymphatic C) nervous D) reproductive