Animals Including Humans：练习题

In which part of the human digestive system is most of the water absorbed back into the body from undigested food?

Which of the following describes the correct path of blood as it leaves the heart to travel to the rest of the body?

During vigorous exercise, why does the human heart rate increase significantly?

In the human digestive system, which organ is responsible for removing water from undigested food to form solid waste?

The following table shows the average resting heart rate (in beats per minute) of four different students:

Student A: 72 bpm
Student B: 65 bpm
Student C: 88 bpm
Student D: 75 bpm

Which student has the lowest resting heart rate, suggesting a potentially higher level of cardiovascular fitness?

Which organ in the human body is responsible for filtering waste products from the blood to produce urine?

Explain the specific role of stomach acid in the human digestive system, besides breaking down food particles.

During a sprint, the body produces carbon dioxide as a waste product. Describe the path this gas takes from the muscle cells to the air outside the body.

Animals Including Humans
Exercise affects the body in many ways. A student measures their heart rate before and after running.

(a) If the resting heart rate is \(72\) beats per minute and it increases by \(50\%\) during exercise, what is the new heart rate?
(b) Why does the breathing rate also increase during exercise?
(c) Name the gas that is a waste product of respiration and must be removed from the body by the lungs.

Animals Including Humans
(a) Identify the three main types of blood vessels in the human circulatory system.
(b) Which type of blood vessel carries blood away from the heart at high pressure?
(c) Describe the function of valves found in some of these blood vessels.