Respiratory & Circulatory Systems

Which of the following most accurately describes the process of Respiration?
Options:
1. Respiration is the process of breaking down sugar in digested food in the presence of oxygen to release energy.
2. Respiration is the process of breathing out.
3. Respiration is the process of breaking down sugar to release energy.
4. Respiration is the process of converting oxygen to carbon dioxide.

Which of the following sets of statements is correct? Blood entering lungs is oxygen-poor; Blood leaving lungs is oxygen-rich., Blood entering lungs is oxygen-rich; Blood leaving lungs is oxygen-poor., Blood entering lungs is oxygen-rich; Blood leaving lungs is oxygen-rich., Blood entering lungs is oxygen-poor; Blood leaving lungs is oxygen-poor.

Which of the following statements is true?

• Exhaled air contains less oxygen, more carbon dioxide and more water vapour, and is warmer than inhaled air.
• Exhaled air contains more oxygen, less carbon dioxide and less water vapour, and is warmer than inhaled air.
• Exhaled air contains more oxygen, less carbon dioxide and more water vapour, and is warmer than inhaled air.
• Exhaled air contains less oxygen, more carbon dioxide and more water vapour, and is cooler than inhaled air.

"There is more carbon dioxide than oxygen in exhaled air." Is this statement true or false?

Trivia! Which of the following statements seems correct? (this question is ungraded, don't worry!)
Options: Larger Mammals = Fast Heart Rate. (think about newborns!), The Heart can beat around 3 to 5 mins outside the body., All blood comes in the same shade of red., No idea......