Tag: cardiac cycle

Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. The pulmonary artery is responsible for transporting oxygen-depleted blood away from the heart and back toward the lungs. Carotid artery is present in the neck region and supply blood to the brain, neck, and face. The aorta is the artery that carries blood away from the heart to the rest of the body. So, the correct option is 'Pulmonary artery'.

Right atrium is just below the right atrium and receives deoxygenated blood from the right atrium and then pumps this deoxygenated blood to the lungs through the pulmonary artery.

Bundle of His is a part of heart, It is collection of heart muscles cells and specialized for electrical conduction .So option (B) Heart is correct answer.

Blood is considered a connective tissue due to two basic reasons: (1) Embryologically, it has the same origin (mesodermal) as other connective tissues (2) Blood connects the body systems together and transports the required oxygen, nutrients, hormones and other signaling molecules, and removes the wastes. 
So, the correct answer is option B.

The cardiac cycle consists of a period of relaxation called diastole, during which the heart fills with blood, followed by a period of contraction called systole. The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate. For example, if heart rate is 72 beats/min, the duration of the cardiac cycle is 1/72 beats/min about 0.0139 minutes per beat, or 0.833 second per beat.

This sequential event in the heart which is cyclically repeated is called the cardiac cycle. Each cardiac cycle consists of systole and diastole of both the atria and ventricles. Each cardiac cycle represents one heartbeat. The number of heart beats per minute in resting person is called as normal heart rate. The normal heart rate is about 72 beats per minute. The heart rate is same as pulse rate because the contractions of the heart cause an increase in blood pressure in arteries that leads to noticeable pulse. Hence each heartbeat generates one pulse in the arteries.

The cardiac output of a normal adult healthy person at rest is almost 5 litres. The volume of blood pumped out of the left ventricle in one beat is called the stroke volume. It is 70 ml.

When at rest, the body's metabolic demand decreases, but the heart rate typically stabilizes at a resting rate rather than increasing or decreasing indefinitely.

The pulse is the rhythmic expansion and recoil of the arteries caused by the ejection of blood from the heart during systole.