Which organelle contains chromosomes?
A. Centrioles
B. Lysosomes
C. Smooth ER
D. Nucleus
E. Ribosomes
Answer: D
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Which of the following statements is true regarding the yolk sac in human embryos?
A. It is the source of the first blood cells. B. It gives rise to the digestive tract. C. It allows for gas exchange. D. It allows for the passage of waste. E. It is the major source of nutrients for the embryo.
The two vertebral arteries fuse to form a large artery called the
A) cerebral arterial circle. B) common carotid artery. C) external carotid artery. D) internal carotid artery. E) basilar artery.
Sympathetic nerves may leave the spinal cord at which vertebra?
A) second cervical B) third lumbar C) first coccyx D) first thoracic
What is the result of sympathetic stimulation to the heart?
A. Squeezing of the pericardial sac B. Decreased intraventricular pressure C. Decreased heart rate D. Increased heart rate and force E. Decreased cardiac output