A heart murmur is an extra or unusual sound heard during a heartbeat. It can be harmless or abnormal. A heart murmur is most often caused by heart valve disease and does not necessarily require treatment.

Endocarditis is an infection of the inner heart chambers and valves. It can also be used to describe an inflammation of the endocardium due to other problems. It is treated with antibiotics and can require surgery to remove or repair infected tissue.

Radiation is the correct answer because it describes the process by which pain from one area is transmitted to another. In this case it is because the heart's afferent nerve entry into the spinal cord is shared with the dermatomal sensory nerves of T1-T5. In particular T5 is located on the medial aspect of the upper arm (stopping at the elbow). Dislocation is when a joint becomes dislodge from its proper placement. Impingement occurs when a nerve or vessel (artery/vein) becomes compressed, typically related to an injury and causes pain. Fracture is the breaking of a bone. Phantom limb pain is felt by amputees in an amputated limb.

A patent ductus arteriosus (PDA) is a type of abnormal connection between the aorta and pulmonary artery. The ductus arteriosus is a normal vessel that is open during the fetal stage, but should close during birth. If the vessel remains open despite the pressure changes at birth, a left to right shunt occurs. It is termed a left to right shunt because blood will flow from the "left side of the heart" to the "right side of the heart" through the PDA. Blood through the heart flows from areas of high pressure to areas of low pressure. Because the aorta (left side of the heart) has higher pressure than the connected pulmonary artery (right side of the heart), blood tends to flow from the aorta to the pulmonary artery via a left-to-right shunt through the PDA.

The correct answer is peaked T-waves. The T-wave of an ECG reading corresponds to repolarization of the cardiac muscle after a ventricular contraction. Cardiomyocytes establish their repolarization through the influx of potassium during the T-wave. If potassium is elevated within the blood (i.e. hyperkalemia), this T-wave reading will be exaggerated due to the excessive influx of potassium into the cardiac cells.

Elevations in troponins are diagnostic for a myocardial infarction (heart attack). Troponin is a protein released into circulation from cardiac myocytes when they die from lack of oxygen. The other laboratory values are not affected by myocardial death.

Fluid or other substances can accumulate in the pleural cavity in the case of volume overload or infections in the body. The buildup of water in the pleural cavity is called hydrothorax.

When there is an accumulation of lymph in the cavity, it is called chylothorax. A buildup of blood is called hemothorax, and when there is pus in the cavity due to an infection such as pneumonia, it is called pyothorax. This fluid can be removed and examined with a procedure called pleuracentesis (pleural tap).

A puncture of the thoracic wall or the lung can result in the elimination of the negative pressure to keep the lung expanded. The air that enters the cavity causes the lung to collapse on itself; this is called pneumothorax.

Similar to a pneumothorax is a tension pneumothorax, in which the air that enters cannot leave, therefore the pressure inside the pleural space builds up. This will displace the structures in the thoracic cavity and mediastinum to the opposite side from the entry wound. Symptoms of a pneumothorax are chest pain, and shortness of breath. To treat, a chest tube can be inserted on the side that is injured.

Infections of the lungs are possible in any age group, but predispositions such as problems in the immune system can make it easier to get an infection. Tuberculosis is a contagious lung disease, and is caused by the bacteria Mycobacterium tuberculosis. It involves formation of granulomas in the lungs. Pneumonia is an inflammatory process in the lungs caused by a bacteria, virus, or mycoplasma. It presents with fever, cough, chest pain, sputum, and shortness of breath. Pulmonary aspergillosis is a fungal infection by Aspergillus fumigatus in the lungs. It will most likely manifest in individuals with weak immune systems and is characterized by fever, cough, wheezing, and fatigue.

Asthma is not considered an infection, but rather an obstruction due to narrowing of the airways. Symptoms are shortness of breath, cough, and wheezing. This constriction is brought on by irritation of the airways due to factors in the environment.

Many diseases can affect the lungs and the lung tissue. When air accumulates in the alveolar sacs chronically due to loss of elastic tissue in the alveolar walls, it is called emphysema. This results in reduced surface area for exchange of oxygen and carbon dioxide, leading to hypoxia and a buildup of carbon dioxide in the blood.

Asthma is a result of a non-patent airway, presenting with shortness of breath and wheezing. Bronchiectasis is the dilation of the bronchi and bronchioles over a period of time, usually due to an underlying disease such as pneumonia or tuberculosis. Symptoms are chronic cough with copious amounts of sputum. Chronic bronchitis is a type of chronic obstructive pulmonary disease (COPD) and is caused by inflammation of the airways due to an irritant, such as tobacco. The individual will present with a chronic cough and shortness of breath and some sputum.