Define and describe the "all or none" response. How does this work in situations such as quiet versus loud sounds?

What will be an ideal response?


Action potentials either occur or they don't. The strength is always the same if they do occur. It is not a graded response. So why does a whisper sound differently from a shout? More cells are stimulated by a shout, so the brain receives more impulses, not stronger impulses.

Biology & Microbiology

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A pregnant woman comes into the hospital past her due date. The doctor decides it is time for the baby to be delivered. Before performing a cesarean section, the doctor wants to try to induce labor. Which of the following would she most likely inject?

A) estrogen B) progesterone C) luteinizing hormone (LH) D) follicle-stimulating hormone (FSH) E) oxytocin

Biology & Microbiology

In the whole-genome shotgun method, the genome is fragmented and individual fragments are sequenced. How is the

order of the nucleotides determined for the original intact chromosome?

a. The fragmentation is done in a systematic way such that the physical arrangement of fragments is readily apparent. b. The random fragmentation produces overlapping sequencesthat can be aligned and assembled to generate the original intact DNA molecule.

c. We supplement our information with data from a different technique to determine the final chromosome arrangement. d. DNA hybridization assays are conducted to determine the physical arrangement of the genes on the chromosome. e. After sequencing, the fragments are labeled and used as probes in a microarray.

Biology & Microbiology

When the body experiences stress, the sympathetic division of the autonomic nervous system

stimulates the adrenal medulla to release

a. epinephrine. b. norepinephrine. c. knockout hormones. d. epinephrine and norepinephrine. e. epinephrine, norepinephrine, and knockout hormones.

Biology & Microbiology

all organs must use _______ primarily for energy

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology