Assume that a woman has a "normal" 28-day reproductive cycle. She is concerned about the times in which she may get pregnant. Her partner tells her that the only day she has to worry about in terms of getting pregnant is the day she ovulates
Explain to her why this is not the case.
Typically, an egg survives about 1 day, and sperm survive about 2 or 3 days (but possibly up to 5 days). This means any sperm deposited in the female system a few days prior to ovulation could fertilize the egg. Because the egg lives only about 1 day, the female should be concerned about the day following ovulation. This typically gives a 4-day window of concern. Further, the timing of ovulation is uncertain, so this must be accounted for as well.
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The birth process in mammals provides an example of positive feedback
Indicate whether the statement is true or false.
The order of signal transmission beginning
with a stimulus is from
a. sensory neuron to interneuron to motor neuron. b. motor neuron to sensory neuron to interneuron. c. interneuron to sensory neuron to motor neuron. d. sensory neuron to motor neuron to interneuron. e. motor neuron to interneuron to sensory neuron
Homeostatic systems work within minimum and maximum values by using positive feedback to regulate activity above and below a set point
Indicate whether the statement is true or false
The exchange of genetic material between nonsister chromatids of a homologous pair in meiosis is called ________
Fill in the blank(s) with correct word