Work of the heart

Each of the tenth pair of cranial nerves, supplying the heart, lungs, upper digestive tract, and other organs of the chest and abdomen.

• vagus
• brain
• sympathetic

An empty space within a solid object, in particular the human body.

• chamber
• cavity
• hollow

To keep in a specified state, position, health.

• maintain
• exit
• entrance

The change in a muscle by which it becomes thickened and shortened.

• nervous connection
• contraction
• expel

Each of the two upper cavities of the heart from which blood is passed to the ventricles.

• atrium
• ventricle
• layer

A hollow part or cavity in an organ

• atrium
• ventricle
• valve

A sheet, quantity, or thickness of material, typically one of several, covering a surface or body.

• bag
• layer
• exit

Any of the sounds heard on auscultation over the heart

• hearbeat
• heart sound
• beat

Something that is contained

• content
• entrance
• exit

An act of going out of or leaving a place

• exit
• content
• vagus