The substance that surrounds the brain and is very similar to blood plasma minus proteins is
A) cerebrospinal fluid.
B) choroid.
C) arachnoid granulations.
D) subarachnoid fluid.
E) None of the answers are correct.
A) cerebrospinal fluid.
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Which bears a close structural relationship with the fossa ovalis?
A. Foramen ovale B. Papillary muscles C. Trabeculae carneae D. Conus arteriosus E. Chordae tendineae
Contraction of these muscles depresses the ribs, but only during forced exhalation
A. External intercostals B. Scalenes C. Transversus thoracis D. Internal intercostals E. Serratus posterior inferior
As a general rule, in temperate regions the most important environmental cue that triggers migration is
A) Photoperiod. B) Temperature change. C) Change in food quality and abundance. D) All of the above
The largest vessels of the lymphatic system are the
A. collecting ducts. B. lymphatic trunks. C. lymph nodes. D. lymphatic capillaries. E. lymphatic collecting vessels.