Define Braxton Hicks contractions
What will be an ideal response
Braxton Hicks contractions are the weak, irregular uterine contractions resulting from the increase in estrogen production. Estrogen causes oxytocin receptors to form on the myometrial cells of the uterus and antagonizes progesterone's quieting influence on the uterine muscle. As a result, the myometrium becomes increasingly irritable, resulting in weak, irregular contractions.
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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) systolic ejection phase. E) dicrotic phase.
Which is NOT a pathogen?
A) meningococcus bacterium B) athlete's foot fungus C) hookworm D) cancer E) chicken pox virus
The area that connects the cell body to the axon is called the
A) Nissl body. B) neurofibril. C) axon hillock. D) axoplasm. E) initial segment.
During muscle contraction, myosin heads attach to actin and thereby form connections called ______________
Fill in the blank with correct word.