In the blood clotting process, platelets arrive at the site of damage and start secreting substances to attract more platelets. More platelets arrive at the site and secrete attractants to recruit more platelets. This is an example of:
A. positive feedback.
B. negative feedback.
C. electrical signaling.
D. feedforward regulation.
Answer: A
Biology & Microbiology
You might also like to view...
In a lichen, the fungal partner
A. provides a substratum within which the alga grows. B. provides water and minerals to the alga. C. protects the alga from excess light intensities. D. All of the choices are correct.
Biology & Microbiology
Which of the following is NOT involved in fevers?
a. the hypothalamus b. increase in activity of phagocytes c. antihistamine d. cytokines e. prostaglandins
Biology & Microbiology
One example of a vaccine made from weakened toxin protects against
a. pertusis. b. polio. c. German measles. d. measles. e. tetanus.
Biology & Microbiology
Lateral roots arise from cells of the cortex. Indicate whether the statement is true or false
Biology & Microbiology