5. Blood enters which of these vessels during ventricular systole? U. A. Aorta V. B. Pulmonary artery W. C. Pulmonary vein X. D. Aorta and pulmonary artery Y. E. Aorta and pulmonary vein 6.
It then helps to pump blood around the body, to supply tissues with oxygen and nutrients and to transport waste products away from the tissues. The blood vessels of three different types which are the capillaries, veins and arteries. The Arteries: * Carry blood away from the heart (always oxygenated apart from the pulmonary artery which goes to the lungs) * Have thick muscular walls * Have small passageways for blood (internal lumen) * Contain blood under high pressure The Veins: * Carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart) * Have thin walls * Have larger internal lumen * Contain blood under low pressure * Have
The first pump pumps "oxygen poor" blood to the lungs from the right ventricle of the heart via the pulmonary artery where it returns as "oxygen rich blood" via the pulmonary vein to the left atrium. It flows through to the left ventricle, where the second pump of the heart pumps the oxygen-rich blood to all the other parts of the body, via the aorta. There are four valves that ensure blood flows in the correct direction, these are the pulmonary valve, the tricuspid valve, the mitral valve and the aortic valve. | | The number of times the heart beats per minute, otherwise known as the pulse rate, is affected by the age and fitness of a person and their current level of activity. The heart's muscle wall is called the myocardium.
When the right atrium contracts, it pushes the blood cells through a valve which leads to another chamber in the heart. This valve is called the tricuspid valve. It is named this because it has three leaflets. It is a one way valve, which normally only allowing blood to travel from the right atrium to the right ventricle. There are certain conditions where the flow can reverse.
The myocardium is the middle layer and is the muscle tissue and majority of the heart. The myocardium is what causes the heart to contract. The heart consists of four heart chambers which receive the blood that circulates through our body. The two main chambers are the right atria and the left atria and the two other chambers are called the right ventricle and the left ventricle. The atria deliver blood the ventricles.
The heart is a complex myogenic organ composed of four chambers and a thick myocardium which has the ability to contract on its own without the intervention of the nervous system. This intrinsic rhythm is generated and controlled by the firing of action potentials of myocardial autorhythmic cells in the sinoatrial node (SAN) known as the pacemaker. The electrical conduction of the heart can be represented by an electrocardiogram (ECG), where each wave corresponds to different stages of the cardiac cycle, with reference to the heart anatomy in figure 3. To understand how an ECG is produced, The Einthoven’s Triangle provides us with different perspectives of the heart which is particularly helpful in distinguishing between depolarisation and
Each renal artery enters its respective kidney at the renal hilus and divides into interlobar arteries. These arteries divide into smaller arcuate arteries and interlobular arteries. The smallest branches of the interlobular arteries are the afferent arterioles which carry blood into the glomerulus a knot of capillaries at the core of each nephron. The afferent arterioles are also lined with juxtaglomerular cells which help to control blood pressure.Each glomerulus is surrounded by a cup-shaped structure call Bowman's capsule. The blood pressure in the glomerulus is high enough that about 10% of the blood fluid volume is squeezed out and absorbed by the Bowman's capsule.
The bag is then inflated until the air pressure in the cuff overcomes the arterial pressure and obliterates the arterial lumen. This is confirmed by palpating the radial pulse that disappears when the cuff-pressure is raised above the arterial pressure. The pressure is then raised further by 20 mm Hg and then slowly reduced. When the pressure in the cuff reaches just below the arterial pressure, blood escapes beyond the occlusion in to the peripheral part of the artery and the pulse starts reappearing. This is detected by the appearance of sound heard in the stethoscope and pressure at which the sounds are first heard is the systolic pressure.
The human heart pumps blood through the arteries, which connect to smaller arterioles and then smaller capillaries. In this assignment, we will discuss the arterial blood pressure from several aspects, include definition, normal values for blood pressure, the most important factors affecting it, the mechanism involved in arterial blood pressure regulation, and the relevance between the pressure and the eye. Definition of blood pressure, it’s Normal value, and the factors that determine arterial blood pressure under physiologic conditions. Blood pressure refers to the force exerted by the blood against the inner walls of the blood vessels . This pressure produces when the heart contracts during the heartbeat cycle, which forces blood out
An optimal range would be a Systolic Blood Pressure (mmHg): 120 or lower.and Diastolic Blood Pressure (mmHg): 80 or lower. [ (Unknown, 140 or Bust: New Goals for Your Blood Pressure, 2001) ] Systolic blood pressure reading is the peak pressure of blood in the arteries when the ventricles of the heart are going through a contraction. Diastolic measurement of pressure is the amount