Biology II

 
  • Blood Circulation B2121511

    Blood Circulation B2121511

    Unit – IV B Heart Surgeries Coronary Angiography: The red arrow shows the block in the coronary artery. The green arrow shows the correction after angioplasty. Imaging is done to check the arteries that supply the heart muscle with blood Coronary angiography. Furthermore, narrowed or blocked coronary arteries can be imaged by Angiography (which are normally not visible on a normal X-ray) […]

     
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  • Blood Circulation B2121510

    Blood Circulation B2121510

    Unit – IV A Heart Related Disorders Hypertension: Symptoms: A healthy adult has a blood pressure reading of about 120/80 mm Hg (120 mm Hg – systolic and 80 mm Hg – diastolic). This often rises normally with age to about 130/90 at 60. Abnormally high blood pressure is known as hypertension. Hypertension is defined as the “Systolic pressure equal […]

     
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  • Blood Circulation B2121509

    Blood Circulation B2121509

    Unit – III B Pattern of Circulation Our Blood moves through the body in an uninterrupted fashion: 1] Left ventricle 2] systemic circulation (body) 3] right atrium 4] right ventricle 5] pulmonary circulation (lungs) 6] left atrium left ventricle. Double Circulation: Double circulation is a process during which blood passes twice through the heart during one complete cycle. This type of […]

     
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  • Blood Circulation B2121508

    Blood Circulation B2121508

    Unit – III A Blood Vessels Study of blood vessels is called Angiology. Blood vessels form network of blood circulating vessels starting from heart (left ventricle) arteries artioles capillaries venules veins back to heart (right auricle). Arteries and Artioles: Arteries carry blood from the heart to the capillaries of the organs in the body. The walls of arteries are thicker than […]

     
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  • Blood Circulation B2121507

    Blood Circulation B2121507

    Unit – II D Blood Pressure and Its Measurement Due to the contraction of the heart and by the muscles that surround our blood vessels, Blood moves through our circulation system since it is under pressure by it. The measure of this force is blood pressure.  In the two main arteries, Blood pressure will always be highest, which is just outside the […]

     
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  • Blood Circulation B2121506

    Blood Circulation B2121506

    Unit – II C Cardiac Activity Regulation of Cardiac Activity: Normal activities of the heart are regulated in an essential or natural way, meaning it is autoregulated by specialized muscles or the nodal tissue, therefore the heart is called myogenic. A special neural center in the medulla oblangata can moderate the cardiac function through the autonomic nervous system (ANS). Neural signals can […]

     
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  • Blood Circulation B2121505

    Blood Circulation B2121505

    Unit – II B Working of Heart (Cardiac Cycle) Joint Diastole: During this step, both the atria and both ventricles relax. The Right atrium then relaxes. Later, the Deoxygenated blood enters the right side of the heart through two large veins called the vena cavae. The superior vena cava returns blood from the head and arms; the inferior vena cava […]

     
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  • Blood Circulation B2121512

    Blood Circulation B2121512

    Unit – V Lymphatic System Tissue Fluid and Lymphatic System: 10% of its fluid escape into the surrounding tissues, as blood proceeds through the capillaries and is known as tissue fluid. Chemicals such as glucose and hormones is carried by this fluid to the cells of the body that are not next to the capillary.It then removes the waste products like […]

     
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  • Blood Circulation B2121504

    Blood Circulation B2121504

    Unit – II A Structure of Human Heart External Structure of Human Heart: Anterior View: Posterior View Sketch of Anterior View of Heart Sketch of Posterior View of Heart Structure of Heart It is hollow, muscular organ that contracts at regular intervals, forcing blood through the circulatory system. It is cone-shaped, about the size of a fist, and is located in the […]

     
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  • Blood Circulation B2121503

    Blood Circulation B2121503

    Unit – I C Blood Groups Karl Landsteiner in 1900 discovered that blood in all persons is not alike and hence clumping or agglutination occurs on mixing of blood of certain persons. Blood group is determined by the antigens present on the surface of RBC’s. An antigen is a molecule (in this case a carbohydrate) that acts as a signal, enabling […]

     
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