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Older people have more trouble with thermoregulation because they have more subcutaneous fat and cannot dissipate body heat efficiently
false - they have less subcutaneous fat
During implantation and about six days after ovulation, the trophoblast forms a deep layer that retains individual cells called the ____ and a superficial layer composed of a multinucleate mass of cells whose plasma membranes broke down called the _____.
which of these lists the stages of prenatal development in correct order?
zygote, cleavage, morula, trophoblast, embryo, fetus
Which of these organ systems shows the greatest structural change in the transitional period after birth?
Evolutionary theorists no longer believe that a function of death is to eliminate old and frail individuals for the good of the species
Senescence of the immune system makes older people more subject to cancer and infectious disease because of a decline in
antigen-presenting cells and helper T cells
The observation that there is a limit to how many times a cell can divide is the basis for the
replicative senescence theory
The optimal "window of opportunity" to conceive a child is
a few days before ovulation to less than a day after
If the blastocyst implants in the uterine tube instead of the uterus, the pregnancy is called
Prior to ejaculation, __________ in the sperm plasma membrane prevents premature release of ____________
Cholesterol; acrosomal enzymes
Muscular weakness tends to develop in old age for all of the following reasons except
Reduced perfusion of the muscles ?????
In the blastocyst, the trophoblast will become _____, and the embryoblast will become _______.
part of the placenta; the embryo
In the fast block polyspermy, binding of sperm opens up _________ channels, which depolarizes the egg membrane and __________
Na+; prevents the entrance of any more sperm
During implantation, the trophoblast divides into a deep layer, the _____________, composed of individual cells, and a superficial layer, the _________, composed of a multinucleate mass of cytoplasm
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