Which is likely to heal faster, a bone injury or a cartilage injury? Why?
Bone injuries heal relatively quickly because of the good nutrient supply by way of nearby blood vessels and the canaliculi, whereas cartilage is supplied nutrients via diffusion from the outside, a far slower process. In addition, in bone the cellular layer of the surface periosteum takes part in remodeling and repair, whereas chondrocytes do not usually divide in an adult.
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Urine passes from the renal papilla into a
A. major calyx, then to a minor calyx, then to a ureter. B. renal pelvis, then to a major calyx, then to a ureter. C. ureter, then to a minor calyx, then to a major calyx. D. collecting duct, then to a minor calyx, then to a major calyx. E. minor calyx, then to a major calyx, then to the renal pelvis.
____________________ work constitutes all forms of biological energy expenditure that do not accomplish mechanical work outside of the body
Fill in the blank(s) with correct word
A muscle that contracts to assist the main muscle in performing a particular action is called a(n)
A. synergist. B. antagonist. C. prime mover. D. agonist. E. fixator.
Arrange the following events in proper sequence:(1) The activating hormone interacts with a membrane-bound receptor.(2) Cyclic AMP causes the cell to carry out a function characteristic for that specific hormone.(3) Adenylyl cyclase catalyzes the transformation of ATP to cyclic AMP.(4) Adenylyl cyclase is activated.
A. 1, 4, 3, 2 B. 1, 3, 4, 2 C. 1, 3, 2, 4 D. 3, 4, 2, 1 E. 1, 2, 3, 4