Answer:
The correct answer is carbon dioxide.
Explanation:
Respiration (physical) process involves inhalation and exhalation of oxygen and carbon dioxide respectively in between the air and into the lungs to the blood. If the brain receptors sense the excess amount of carbon dioxide in the blood, they send signals the body to promote ventilation. So, the most important chemical regulator of respiration is carbon dioxide that determines the respiratory rate.
An increase in carbon dioxide concentration in blood results in a decreasing pH level of the blood, causing the person to increase his rate of ventilation.
Thus, the correct answer is carbon dioxide.
Answer:
d. umbilical cord
Explanation:
The blood vessels of the fetus and the maternal placenta connect through the umbilical cord.
Answer: tumor
Explanation:
- Tumors, which are lumps of tissue occur when cells divide and grow excessively in the body. Tumors can be cancerous or not cancerous (benign). Cancerous tumors spread into, or invade, nearby tissues and can travel to distant places in the body to form new tumors.
- If possible, an option for cancer treatment is removal of the tumor which is fueling the cancer. The idea is that when you take out the source, everything else will clear up and you should ultimately be cancer free. Although it is one of the best options, it is not always successful.
hope this helps :)
