What are the main structural differences between cartilage and bone?
What will be an ideal response?
Cartilage has a matrix that is equivalent to a firm gel; in contrast, bone is hardened and impermeable.
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What is "allosteric modulation"?
A. The fact that all binding sites on a protein must be occupied to have a biological effect B. The ability of a single ligand-binding site to bind to molecularly similar ligands C. Regulation of physiological functions by the sympathetic division of the autonomic nervous system D. The change in the shape and functional state of a protein that occurs when a ligand binds to a regulatory site E. Modification of the functional state of a protein by temperature or pH
Resistance exercise will most likely cause muscle to ________.
A. atrophy B. dystrophy C. hypertrophy D. myopathy E. apathy
Most of the calcium that triggers contraction of cardiac muscle comes
A. into the cell through leakage channels in the sarcolemma. B. from the Golgi apparatus of the cell. C. into the cell through voltage-gated channels in the sarcolemma. D. from the sarcoplasmic reticulum of the cell.
Which secrete steroid hormones? select all that apply.
a) adrenal cortex b) ovary c) testes d) adrenal medulla e) liver