What enzyme breaks down acetylcholine into acetic acid and choline to prevent continued contraction of the muscle fiber?
A) potassium ions
B) cross bridges
C) calcium ions
D) sarcoplasmic reticulum
E) acetylcholinesterase
E
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Most of a cell's DNA is located in its
A) ribosomes. B) lysosomes. C) Golgi apparatus. D) nucleus. E) nucleolus.
The respiratory system
a. obtains O2 from and eliminates CO2 to the internal environment b. includes the heart and lungs c. helps regulate the pH of the internal environment by removing acid-forming CO2 from the blood d. performs all of the functions listed above e. obtains O2 from and eliminates CO2 to the internal environment and helps regulate the pH of the internal environment by removing acid-forming CO2 from the blood
The most important metabolic effect of ________ is protection against ________, crucial to surviving significant stress.
Fill in the blank(s) with the appropriate word(s).
Which process builds up food molecules into more complex molecules?
a. anabolism b. catabolism c. nutrition d. absorption