What helps oxygen to be observed rapidly into the blood in the lungs ​

the alveoli in the lungs are tiny air sacs and they absorb/diffuse oxygen into the bloodstream.

hope this helps

comment for a more detailed explanation if needed x

answer: i cant find your answer. do u have another way i can answer it for you : )

explanation:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.