What causes muscle contraction and the vocal cords partically obstruct?

When does the discharge process planning start for a patient having surgery? 

What is a high-pressure system that is used to remove secretions and debris from a patient’s airway?

Type AB blood is the universal donor of plasma and the universal recipient of cells, and type B is the universal donor of cells only.

Chest pain that is caused by restricted blood flow to the heart is:

Atrioventricular Node is located beneath the endocardium of the right atrium, the AV node transmits electrical impulses to the bundle of His.

Neuromuscular tissue is capable of causing cardiac muscle to contract rhythmically. This tissue comprises the sinoatrial node, the atrioventricular node, and the atrioventricular bundle.

Each tooth contains 3 main portions: the crown, the root, and the neck. 

Which of the following is NOT a function of the liver.   

________ allows muscles to change shape to become shorter and thicker.