violamashego2919 violamashego2919
  • 14-03-2024
  • Medicine
contestada

What causes valves in the heart to open and close?
A) Changes in pressure within the heart chambers
B) Electrical signals from the brain
C) Hormonal signals from the endocrine system
D) Contractions of the heart muscle fibers

Respuesta :

Otras preguntas

Is this the Persian, Mongol, Russian, or British Empire?
please help asap! thanks! no links or reported
Frodo was the only one present who had said nothing. For some time he had sat silent beside Bilbo's empty chair, and ignored all remarks and questions. He had e
Using his telescope tommy watches a bald eagle as it sits ono top of a cliff. The telescope is positioned so that the line of sight to the eagle forms a 38 degr
PLEASEEEEE HURRRRY SOMBODY ANSWER THESE QUESTIONS FOR MEEEE
When rolling a number cube numbered 1 to 6, how would you describe the chances of rolling a number greater than or equal to 2 versus rolling a number less than
What does "mixed number in its lowest form." mean?
WILL GIVE BRAINIEST please solve this page i need it badly and only answer with actual answers
Which number on the map shows the Yangtze River? 1 2 3 4
Which events increased tensions between the Japan and the United States in the late 1930s? Select three options.