Why does blockage of the coronary artieries often lead to a heart attack?
What will be an ideal response?
Ans: Because it cannot get blood back to the heart
You might also like to view...
Barrier reefs are separated from land by shallow lagoons
Indicate whether the statement is true or false
Carbohydrates are classified into several categories, based on their size and their composition. Which of these is the simplest type of carbohydrate?
A) disaccharide B) polysaccharide C) monosaccharide D) starch E) cellulose
Defects in cell signaling can lead to a cancerous cell due to:
A. overproduction of signals that trigger cell division. B. overproduction of a receptor that triggers cell division. C. a defective receptor that stays in the activated state and triggers cell division continuously. D. a defective signal-transduction protein that stays in the activated state and triggers cell division continuously. E. All of these choices are correct.
The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water. b. near the radio emission of oxygen molecules. c. between the radio emissions of hydrogen and oxygen. d. between the radio emissions of hydrogen and OH. e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.