Answer:
A
Explanation:
Air moves down the trachea, a long straight tube in the chest. The diaphragm pulls air in and pushes it out. Behind the nasal cavity, air next passes through the pharynx, a long tube that is shared with the digestive system. Both food and air pass through the pharynx. A flap of connective tissue called the epiglottis closes over the trachea when food is swallowed to prevent choking or inhaling food. In humans, the pharynx is important in vocalization.
Answer:
Thank you... Also to anyone who is reading this just that you mean a lot to others and every day may not be good but their is something good in everyday.Thank you for taking the time out of you day and just wanted to say hope you have a good rest of you day:)
Answer:
Consider that a 4-week-old fetus forms new neurons at a rate of 250,000 every minute, and by the time a child is three, their brain will reach 80 percent of adult volume and process close to 1000 trillion connections between neurons.
Explanation:
Answer:
D. Organs and muscles require more blood under stress.
Explanation:
Because muscular contractions can have a protracted metabolic expenditure because it has to be adjusted to the demands of the contracting muscles.
