The __________ show(s) a remarkable degree of degeneration (involution) with age.
A. lymph nodes
B. thymus
C. spleen
D. pharyngeal tonsils
E. appendix
B. thymus
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A human cell that has 69 chromosomes is
A. aneuploid. B. triploid. C. euploid. D. diploid.
Which part of the eye is highly vascularized and contains melanin that absorbs light to prevent reflection?
A) retina B) choroid C) iris D) sclera
Which of the following shows the components of the cardiac conduction system in the correct sequence?
A. AV bundle, left and right bundle branches, SA node, AV node, Purkinje fibers B. SA node, Purkinje fibers, AV node, AV bundle, left and right bundle branches C. AV node, SA node, Purkinje fibers, AV bundle, left and right bundle branches D. SA node, AV node, AV bundle, left and right bundle branches, Purkinje fibers E. Purkinje fibers, left and right bundle branches, AV bundle, SA node, AV node
During systemic gas exchange, oxygen diffuses from the blood to the tissues and carbon dioxide diffuses from the tissues to the blood.
Answer the following statement true (T) or false (F)