Answer:
When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
Answer:
D) fertilization
Explanation:
Fertilization is the name given to the fusion of male and female gametes. By themselves, female egg cells -- called ova -- and male sperm cells cannot grow and divide. However, once a sperm cell breaks through the egg cell membrane, the genetic material combines and the new organism begins to grow and develop as a living thing.
BUIWBFUIWBVUUIVVNUFOVEIVNVBEHUVRBIHKSEGBYRIUVHREVIYGRFRGEIAUSGRHJHVBRKGFRITHGUUGBIRGBETJBGRHJGRE
Answer:
Epinephrine binds to receptors on some smooth muscles (ex: around arterioles) → Ca++ released from ER → intracellular Ca++ up → stimulates contraction. c. Epinephrine binds to receptors on some smooth muscles (ex: around bronchioles) → phosphorylates protein needed for response to Ca++, preventing response.
