In external respiration carbon dioxide move from capillaries to alveoli, while oxygen move from alveoli to capillaries in internal respiration.
Number 3 the answer is c HOP IT HELP
Curare will bind to the receptor but it doesn't cause the ion to flow inside. This will prevent the person from sent signal to the muscle. When the person trying to move the muscle, curare will also prevent acetylcholine to bind so there will be no muscle contractions. The symptoms would be paralyzed of muscle that uses ach receptor.
The centre of the nucleus is an atom
