One of the characteristics of muscle tissue is that is has excitability. Which of the following best describes this characteristic?
A) Muscles respond when stimulated.
B) Muscles have membrane potentials.
C) Muscles only pull; they cannot push.
D) Muscles can stretch when needed.
Ans: A) Muscles respond when stimulated.
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Water has the ability to dissolve polar covalent molecules like sucrose by
A) forming hydration spheres around the molecule. B) pulling atoms out of the molecule and into solution. C) creating crystals of positively and negatively charged atoms. D) taking electrons from the polar covalent molecule. E) ionization.
Which of the following bonds are classified as weak bonds?
A) Hydrogen bonds, ionic bonds, van der Waals forces B) Hydrogen bonds, ionic bonds, disulfide bonds C) Ionic bonds, van der Waals forces, ester bonds D) Peptide, bonds, disulfide bonds, ether bonds
More tension is developed during twitch summation than during a single twitch because the duration of elevated cytosolic Ca2+ concentration increases during summation, thus increasing the availability of cross-bridge binding sites
Indicate whether the statement is true or false
Paul is getting ready to blow up a pool float because he can't find the air pump. He takes a big breath in after exhaling normally. The air he takes in is the ________.
A. vital capacity B. inspiratory capacity C. inspiratory reserve volume D. tidal volume