The ________ prevents premature stimulation of developing T cells.

Fill in the blank(s) with the appropriate word(s).


blood—thymus barrier

Anatomy & Physiology

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For a person whose hematocrit is 45%, in which choice below are the components of blood correctly ranked in order of decreasing percent volume?

A. WBCs, plasma, RBCs B. RBCs, WBCs, plasma C. plasma, RBCs, WBCs D. plasma, WBCs, RBCs E. WBCs, RBCs, plasma

Anatomy & Physiology

Which of the following would not be considered a mutagen?

A. Ethidium bromide, a chemical that binds directly to DNA and deforms the double helix B. Flavonoids, a family of compounds which can remove free radicals from cells C. X-rays, which can break the bonds in DNA molecules D. Nitrous acid, which can convert cytosine to uracil

Anatomy & Physiology

When do mammary glands primarily develop within the breasts?

A. At birth B. During infancy C. During puberty D. During the last weeks of fetal development E. During pregnancy

Anatomy & Physiology

The papillary muscles attach to the cusps of the atrioventricular valves by means of the

A. trabeculae carneae. B. tricuspid valve. C. pectinate muscles. D. chordae tendineae. E. conus arteriosus.

Anatomy & Physiology