What is the term that means an enlarged heart?
The term cardiomegaly usually refers to an enlarged heart as seen on imaging tests, usually the chest X-ray. The heart is composed of four chambers, and an enlargement of any of the chambers can result in cardiomegaly.
What is contraction of the heart called?
The period of relaxation is called diastole. The period of contraction is called systole. Diastole is the longer of the two phases so that the heart can rest between contractions. In general, the rate of heartbeat varies inversely with the size of the animal.
What does decreased heart contraction mean?
The heart muscle contracts normally but the ventricles do not relax as they should during ventricular filling (or when the ventricles relax). Reduced ejection fraction (HFrEF) – also referred to as systolic heart failure. The heart muscle does not contract effectively, and therefore less oxygen-rich blood is pumped out to the body.
What is the contraction phase of the heart is known as?
Each beat of the heart has two phases that indicate the contraction and the relaxation periods of the heart. The contraction and relaxation of the heart together make up the cardiac cycle. The contraction phase is known as systole. The relaxation phase of the heart is known as diastole.
Which chambers are in the correct order to best represent the flow of blood through the heart?
Place the following chambers in the correct order to best represent the flow of blood through the heart once blood has returned to the heart from the SVC and IVC. 1) Right atrium 2) right ventricle 3) left atrium 4) left ventricle.
What are the events of an action potential of a ventricular cardiocyte?
List in order the events of an action potential of a ventricular cardiocyte. 1. Voltage-gated Na channels open. 2. Influx of Na causes more Na channels to open; depolarization. 3. Na channels close as membrane potential peaks at +30 mV. 4. Ca enters through slow calcium channels; creates plateau.
What are the three layers of the heart wall?
diastole. List in order the three layers of the heart wall from deep to superficial. 1) Endocardium 2) myocardium 3) epicardium. Components of the cardiovascular system: Heart, arteries, veins, capillaries. The ___ are the lower chambers of the heart that pump blood to the lungs and to the body. ventricles.
Is systole proportional or proportional?
systole. Similar to increasin the volume of air in a deflated tire, the pressure and volume of blood being added to a chamber are: directly proportional (pressure and the volume of blood within a chamber are directly proportional.
