Answer the following statements true (T) or false (F)
1. The morula stage precedes the embryonic stage.
2. By the end of the first trimester, the gender of the baby can be identified.
3. The primary germ layers develop during the second trimester of pregnancy.
4. Exposure to a teratogen is most dangerous to the embryo during the morula stage.
5. Teratogens can include x-rays and alcohol.
1. FALSE
2. TRUE
3. FALSE
4. FALSE
5. TRUE
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Progesterone increases the thickness of the myometrium in preparation for implantation
Indicate whether the statement is true or false.
The phase in the cardiac cycle when the mitral valve is closed and the aortic valve is open is the
A) atrial systole. B) early diastolic filling phase. C) late diastolic filling phase. D) ventricular ejection of ventricular systole. E) dicrotic phase.
"Rest and digest," as well as the maintenance of homeostasis, is associated with the action of the _________ division of the ANS
Fill in the blank with correct word.
Erection of the penis is caused by
A) erectile tissues that become engorged with blood. B) the penis filling with the semen to be ejaculated. C) contraction of the longitudinal muscles. D) protrusion of the os penis, the penis bone. E) None of the answers are correct.