Question

SO B) Yes. Choking can kill you. Yes. It's really easy to choke on food pieces. No. This allows you to breathe when you are eating. No. This allows you to still taste food when your nose is stuffy. No. This allows you to take in twice as much air. D) E -. Hemoglobin in the red blood cells "grabs" oxygen to transport it to the body's cells. What is the equivalent substance that "grabs" carbon dioxide to transport it out of the cells? A) Epiglottin B) Plasma C) White blood cells D) Carbon dioxide isn't transported by the blood. E) Carbon dioxide dissolved easily in the blood, so no special molecule is required. What makes heart cells beat together? A) They beat by themselves. B) The brain C) The pacemaker D) The heart itself E) Spinal nerves

Answer 1

Q1) Answer d. Carbon dioxide is dissolved easily in blood so special molecule is required for its transportation.

Q2) Answer c. Pacemaker.

Pacemaker maker cells which is normally present in the SA node decides the rate of contraction of cardiac muscles and also helps in its synchronization.