Which valve is located between the left atrium and the left ventricle?

In which chamber of the heart is more blood present?

The mitral valve in mammals guards the opening between:

During human fetal development, the pulmonary artery is connected to the aorta by a narrow duct called the ductus arteriosus. What is this structure called after it closes and becomes a fibrous remnant in an adult?

'$Heart\; of\; Heart$' is

Which of the following minerals is responsible for regulating your heartbeats?