chest - n. the front part of the body between the neck and the stomach

tangle - n. a twisted knot of hair, thread or wires

congenital - adj. existing since birth

heart – n. the organ in your chest that pumps blood through your veins and arteries

surgery - n. medical treatment in which a doctor cuts into someone's body in order to repair or remove damaged or diseased parts

NGO - n. a non-governmental organization, such as a charity