Answer:
A. Organ.
Explanation:
Cells make up
tissues, tissues make up an organ. Organs make organ system
Answer:
The Cardiovascular System
Explanation:
The respiratory system draws air into the lungs. Oxygen diffuses through the walls of the alveoli and across the walls of the capillaries where it enteres the bloodstream. The oxygen molecules are picked up by red blood cells, which are pumped through the blood vessels by the action of the heart. As the red blood cells carrying oxygen pass through capillaries near the cells, oxygen diffuses into the cells.
Please finish the sentence.
Average atomic mass is 87.62 +- 0.01 u
Answer:
El tejido óseo sirve como depósito y fuente de calcio para estas necesidades metabólicas críticas a través del proceso de remodelación ósea. El metabolismo del calcio está regulado en gran parte por el sistema endocrino de la hormona paratiroidea (PTH) -vitamina D, que se caracteriza por una serie de circuitos de retroalimentación homeostática.
Explanation:
