中国大学MOOC: The human body is incredibly __________. When you donate a pint of blood, you lose about 3.5 trillion red blood cells, but your body quickly replaces them.
举一反三
- 中国大学MOOC: White blood cells patrol the body searching for potential sources of infection and destroy invading pathogens, such as ________, ________, ________, and ________.
- Hematochezia() A: the presence of red blood cells in the urine B: abnormally dark tarry feces containing blood C: serious bleeding inside a person's body D: the passage of fresh blood through the anus
- When you change your mind about stress, you can change your body's response to stress.
- Blood viscosity increases when blood flows through the body surface.
- 中国大学MOOC: In order to control your blood pressure, you should _______.