The lining of a capillary is called the
A. endothelium.
B. adventitia.
C. pericapillary layer.
D. thoroughfare layer.
E. tunica adventitia.
A
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The arachnoid villi lack the tunica externa or adventitia found in blood vessels.
Answer the following statement true (T) or false (F)
Which statement accurately describes alveolar and systemic gas exchanges?
A. In both alveolar and systemic gas exchange, oxygen diffuses out of the blood. B. In both alveolar and systemic gas exchange, oxygen diffuses toward the blood. C. In alveolar gas exchange oxygen diffuses into the blood, but in systemic gas exchange it diffuses out of the blood. D. In alveolar gas exchange oxygen diffuses out of the blood, but in systemic gas exchange it diffuses into the blood.
Which of the following is an evolutionary hypothesis to explain morning sickness?
A. It alerts the woman that she is pregnant so that she is careful not to expose herself to harmful substances. B. It is a natural form of birth control. C. It is an adaptation to protect the embryo from toxins. D. It prevents too much weight gain during pregnancy. E. It is a vestigial artifact left over from early mammalian ancestors.
Which of the following correctly describes a malignant neoplasm?
A. A neoplasm that remains localized B. A neoplasm in which cells have broken off and traveled to other parts of the body where they are producing more abnormal cells C. A neoplasm that is encapsulated D. A neoplasm that does not metastasize