What are the main functions of the human skeletal system

What is earths lithospheric plates interact at

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.