A nephron has two parts:
A) proximal convoluted tubule and distal convoluted tubule.
B) collecting duct and convoluted tubules.
C) renal corpuscle and renal tubules.
D) glomerulus and collecting duct.
E) renal tubule and collecting duct.
C) renal corpuscle and renal tubules.
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Active sites on the actin become available for binding after
A) actin binds to troponin. B) troponin binds to tropomyosin. C) calcium binds to troponin. D) calcium binds to tropomyosin. E) myosin binds to troponin.
Which disease is not associated with obesity?
A) heart disease B) gout C) cancer D) diabetes mellitus E) kidney disease
Rani has read how important Ca2+ ions are to muscle contraction and neuron function. Rani, age 25, hates milk and most dairy products, and doesn't think she eats many foods that are sources of calcium, nor does she take supplements. Why don't Rani's muscles and nerves show problems related to calcium deficiency? What problems might Rani encounter later in life if she continues this lifestyle?
What will be an ideal response?
What is responsible for initiating contraction of smooth muscle?
a. Stimulation by motor neurons b. Inhibition of acetylcholinesterase c. Membrane potential drifting to threshold as a result of automatic changes in ion movement across the membrane d. Excitation of the gap junctions by a transmitter substance e. Stimulation by the autonomic nervous system