Enzymes help to speed up chemical reactions by
A. lowering kinetic energy
B. lowering activation energy
C. increasing kinetic energy
D. increasing activation energy
Ans: B. lowering activation energy
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There are three gluteal muscles. Select the one that is correctly matched with its primary action
A. Gluteus medius: abducts the thigh B. Gluteus maximus: abducts the thigh C. Gluteus minimus: rotates the thigh
The heart is situated within the medial section of the thoracic cavity known as the ________
A) mediastinum B) hiatus C) pleural cavity D) hilus E) diaphragm
Why does inhaling deeply and slowly through the nose help to identify an odor?
A. Threshold for odor detection is high. B. More air containing the odor is brought into contact with the olfactory epithelium. C. Receptors in the olfactory epithelium are highly specific. D. The tissue needs more time in contact with the odor. E. Impulses originate slowly in the olfactory epithelium.
Compact bone is arranged in concentric circles around ________, and smaller ________ bring nutrients to osteocytes.
A. central canals; canaliculi B. lacunae; canaliculi C. central canals; osteons D. lamellae; central canals