In a study of ancient populations, what feature of skeletons would an anthropologist use to determine whether or not individuals were engaged in activities such as heavy lifting?
A. The size of the pelvis
B. The markings on bones related to mechanical stress
C. The microscopic structure of the compact bone
D. The size and shape of the skull
E. The microscopic structure of spongy bone
B. The markings on bones related to mechanical stress
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Thymic hormones
A. stimulate T-lymphocyte maturation and differentiation. B. are produced by the cortical lymphocytes. C. stimulate the activity of nurse cells. D. are secreted in response to stimulation by activating hormones from the pituitary gland. E. are stored in thymic corpuscles prior to release.
The myogenic mechanism
a. causes the afferent arteriole to constrict when blood pressure is too high b. may result from stretching of vascular smooth muscle c. is an autoregulatory mechanism d. reduces GFR e. has all of the above characteristics
Concentric lamellae within an osteon are connected by lacunae.
Answer the following statement true (T) or false (F)
The depressor anguli oris muscle
A. puckers the mouth for kissing. B. contributes to pouting. C. contributes to laughing and smiling. D. causes crow's feet wrinkles. E. raises the eyelid.