Check all that are a function of the pericardium.1. prevent the heart from bouncing in the thoracic cavity2. prevent the heart from overfilling with blood3. aid the heart in the strength of contractions4. create a frictionless environment through the production of serous fluid

All the options are correct.

Explanation:

A pericardium is the sac that compass the heart , protects , lubricate and keep it in place.

The functions of pericardium are:

1. It keep the heart fixed in its place in the chest cavity.

2. It prevent the heart from stretching and overfilling with blood I.e it minimize blood infow.

3. It prevents friction by lubricating the heart.

4. It protects the heart from infection that might be nearby either from lungs or other organs.

d

explanation:

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.