Answer: A
Explanation: The blood–air barrier (alveolar–capillary barrier or membrane) exists in the gas exchanging region of the lungs. It exists to prevent air bubbles from forming in the blood, and from blood entering the alveoli. ... The barrier is permeable to molecular oxygen, carbon dioxide, carbon monoxide and many other gases.
Answer: Fitness training balances five elements of good health. Make sure your routine includes aerobic fitness, strength training, core exercises, balance training, and flexibility and stretching.
Explanation:
Answer:
B. False
shoes can't help you lose weight and improve muscle tone.
Answer:
The five things are below.
Explanation:
1. Health. Physical activity helps and improves your health, as it allows for good cardiovascular health, respiratory health, and many more.
2. Mobility. Physical activity helps and improves your mobility because it allows for your muscles to allows be broken down and fixed again, and it allows for your joints to be lubircated.
3. Mental health. Physical activity helps and improves your Mental health because exercise releases serotonin (the feel-good hormone). It also can help you get your mind off negative things.
4. Sleep. Physical activity helps and improves your sleep because when you exercise, you become tired. Allowing for a long and great sleep time (be sure not to exercise too hard before bed, as that can have the opposite effects).
5. Weight. Physical activity helps and improves your weight because it can help you lose weight. If you're struggling with weight loss, try to go on short walks every day, and you will see the weight drop.
(But be sure to have a good and healthy diet along with exercise).
Answer:
Doubling over, pale complexion, tears, furrowed brows
Explanation:
<u>Doubling over</u> is a reaction to clench the stomach when someone is in pain. <u>Pale complexion</u> is a result of blood loss, fear, anxiety, dehydration/light headedness, and loss or red blood cells. <u>Tears</u> (depending on the context) are a way to let out emotion - both sad and happy. <u>Furrowed brows</u> is usually a sign of discomfort which is usually a consequence of worrying too much or crying too much, both of which require face muscles to tense for a long(ish) period of time.
