Mucus
What will be an ideal response?
Answer: a slippery secretion produced by the mucous membranes that protects and lubricates these tissues, this the nose, it helps to moisten, warm, and filter the air as it enters
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Which of the following statements concerning the length-tension relationship of skeletal muscle is incorrect?
a. when a muscle is maximally stretched, it can develop the most tension upon contraction because the thin filaments can slide in a maximal distance. b. maximum tension can be developed if the muscle is at its lowest at the onset of contraction. c. in the body, the relaxed length of muscle is at its optimal length. d. when the initial length of muscle prior to contraction becomes very short, tension is decreased during contraction because of thin filament overlap, because the thick filaments are compressed against the Z lines, and because not as much Ca2+ is released during excitation-contraction coupling. e. the tension that can be achieved during a tetanic contraction is less when a muscle is shorter or longer than its optimal length at the onset of contraction.
A reduction division is one in which
A. the chemical reactions of oxidation and reduction take place. B. the daughter cells receive only half as many chromosomes as the parent cell had. C. one daughter cell is substantially reduced in size compared to the parent cell. D. the size of chromosomes is reduced from double-stranded to single-stranded.
A mutation involving a single nucleotide is a _____ mutation
A. deletion B. duplication C. nondisjunction D. point E. aneuploidy
The cerebral arterial circle (circle of Willis) involves blood flow through the liver
Indicate whether the statement is true or false