Maddy and eric are both in their 40s. they have spent their early adult years focusing on their education and careers. now that they are financially secure and successful, they want to have a baby. maddy and eric should know that couples in their 40s have a percent infertility rate.

Maddy and Eric are both in their 40s. They have spent their early adult years focusing on their education and careers. Now that they are financially secure and successful, they want to have a baby. Maddy and Eric should know that couples in their 40s have a senescence or 50 percent infertility rate.

Explanation:

50%

Explanation:

    A recent study showed that with each menstrual cycle 20% of women aged 30-31 will become pregnant. This percentage drops to 13.2% in the 38-39 age range and to only 6.6% at 42-44 years.

    However, the incidence of twin pregnancy tends to increase after age 30, as messier menstrual cycles can make women release more than one egg a month.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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