Eventually, the placenta secretes the major hormones that regulate pregnancy. Until then, what is the main source of hormones?
A. The umbilical cord
B. The endometrium
C. The corpus luteum
D. The pituitary
E. The amnion
C. The corpus luteum
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Sponges do not have a true circulatory system, but they can propel water through their bodies using flagellated __________
Fill in the blank with the correct word.
Which of the following statements concerning olfaction is true?
A. Olfaction first goes to the thalamus and is then relayed to the cerebral cortex. B. Continued stimulation of olfactory neurons produces the same level of response. C. Olfactory epithelial receptors are highly specific. D. Replacement of neurons is a common phenomenon in the body. E. Damaged olfactory neurons are replaced.
Which represents the pressure of blood in between contractions, when the ventricles are at rest?
A. Diastolic B. Systolic
When do cells divide? select all that apply.
a) when they grow large enough to have enough cytoplasm to distribute to their two daughter cells b) when neighboring cells die, opening up space in a tissue to be occupied by new cells c) when they snugly contact neighboring cells or when nutrients or growth factors are withdrawn d) when they have replicated their DNA, so they can give each daughter cell a duplicate set of genes