Which of the following is NOT a general category of cell signaling molecules?
A. Endocrine signaling
B. Paracrine signaling
C. Synaptic signaling
D. Enzymatic signaling
Answer: D
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Red blood cells with an internal osmolarity of 300 mOsM are placed in the following solutions. Designate each solution according to its osmolarity and tonicity, and explain what happens to the cells and why.
A. 200 mOsM NaCl B. 400 mOsM urea C. 100 mOsM urea plus 200 mOsM NaCl D. 300 mOsM urea E. 300 mOsM NaCl F. 200 mOsM urea plus 300 mOsM NaCl G. 400 mOsM NaCl
Label P represents which of the following structures?
A) nephron loop
B) renal corpuscle
C) proximal convoluted tubule
D) distal convoluted tubule
E) collecting duct
What law of thermodynamics states that energy can be neither created nor destroyed?
a. first b. second c. third d. fourth e. fifth
Which of the following is true of joints that are first-class levers?
A. The fulcrum is at the opposite end from the tendinous attachment. B. Their output force is always greater than the input force. C. Their mechanical advantage is always less than 1.0. D. Their resistance is between the fulcrum and the distal end of the bone. E. The fulcrum is in the middle.