CH 4 Quiz

A teratogen is best defined as a. a birth defect caused by genetic abnormalities. b. any drug, disease, or environmental agent that causes a birth defect. c. anything that can cross the placental barrier. d. any medication taken during labor and delivery.

any drug, disease, or environmental agent that causes a birth defect.

All major organs initially develop in some fashion during the _____ period. a. fetal b. germinal c. embryonic d. zygotic

embryonic

A deficiency in maternal levels of _____ during early pregnancy has been linked to a risk for neural tube disorders. a. iron b. folic acid c. vitamin A d. calcium

folic acid

Frieda receives an Apgar rating of 8. This means that she a. will likely die without extraordinary intervention. b. is doing just fine. c. has visual and auditory deficits. d. is having difficulty breathing.

is doing just fine.

Myelin improves a neuron's ability to transmit by a. increasing the number of neurons. b. providing an insulating cover to the neuron. c. assisting in the migration of neurons to their proper location. d. organizing neurons into specific areas of the cortex (e.g.. the auditory cortex).

providing an insulating cover to the neuron.