Which of the following rows correctly identifies the stage in development and the embryonic age most sensitive to teratogens, respectively? Select One: a). Stage: fetus, Embryonic age: 9 to 16 weeks, b). Stage: embryo Embryonic 6 to 12 weeks. c). Stage: fetus, Embryonic age 9 o 40 weeks d). Stage: embryo, Embryonic age: o to 9 weeks. 

I think its b teratogens happen during the first trimester and that happens in the embryoic development. but im not sure 

The above image has hypothalamus-> B->D->F going up and then across. Then it is showing an arrow from the hypothalamus going down and then across to C->E->smooth muslce contractions.

Match the letters from the feedback loop diagram above with their descriptions given below. 

How does the human body ensure that another pregnancy does not occur during embryonic and fetal development?

During the first trimester, hCG produced from the chorion maintains the corpus luteum. What is the purpose of maintaining the corpus luteum?

What are the neurotransmitters – types and differences

please get back with me, as soon as possible. Thank you :)

endocrine system( triggers and stops, organs that produce or store, target organs) Hi, I'm reviewing the endocrine system this is where different hormones are produced and released. I'm not sure what my teacher means by tirggers and stops. is she talking about what triggers the release of hormones an what stops them? please get back with me ASAP thanks! :)

what causes the hormones from being secreted by the endocrine gland/styem? I've already did posterior pituitary glands and their hormones and anterior pituitary and their hormones. I just need a little boost to jog my memory. please get back with me ASAP thanks :)

Some repsonses stimulated by hormones secreted during stress: 

1. increased heart rate 

2. secretion of cortisol

3. increased reabsorption of water

4. conversion of amnio acids into glucose

match the responses listed above with the hormones given below: 

adh,acth,cortisol,epinephrine

Explain the differences between the actions of acetylcholine and serotonin on the membranes of neurons?

This is a reivew of signal transmisson between neurons.... Not sure what to write for this. Please help me out, thank you so much. Have a goodnight :) 

some steps involved in the process of in vitro fertlizaton

1. eggs are removed from ovary

2. fsh is adminstered to egg donor 

3. fertilization occurs in a artifical medium

4. ultasound is used to monitir the development of follicles. 

is it not 1324?