Monthly archives: January, 2015

PMT AIPMT Practice Questions – National and State Level

1. In humans, the HIV virus primarily attacks which of the following types of cells? (a) Epidermal cells (b) Red blood cells (c) White blood cells (d) Neurons 2. A biologist counted 2,500 cells from an embryo on a mircroscope slide and recorded the following data. Stage                                    Number of cells Prophase                             125 Metaphase                          50 Anaphase                            …

AIPMT PMT Circulatory System Practice Questions

1. Which of the following is correct about human heart? (a) The volume of both atria > the volume of both ventricles (b) The volume of both ventricles > the volume of both atria (c) The volume of both atria = the volume of both ventricles (d) Ventricles are upper chambers and atria are lower …

Circulatory System – Blood Vessels

Blood Vessels • Blood vessels are intricate networks of hollow tubes that transport blood through the entire body. • Blood vessels (except capillaries) are made up of three layers – tunica externa, tunica media and tunica interna, surrounding the central blood carrying canal (known as lumen). – The tunica externa or tunica adventitia, strong outer …

Electrocardiogram-Blood Pressure and Blood Circulation

Electrocardiogram When the cardiac impulse passes through the heart,  electrical current also spreads from the heart into the  adjacent tissues surrounding the heart. A small portion of the current spreads all the way to the surface of the body. If electrodes are placed on the skin on opposite sides of the heart, electrical potentials generated …

Cardiac Cycle

Cardiac Cycle • Cardiac cycle is the term referring to all or any of the events related to the flow or pressure of blood that occurs from the beginning of one heart beat to the beginning of the next heart beat. • The contraction phase is called as systole while the relaxation phase is called …

Heart Beat and Pulse

Heart Beat To pump the blood into blood vessels, heart regularly contracts and relaxes in a rhythmic manner. It is known as ‘heart beat’. • Each heart beat includes one systole (contraction phase) and one diastole (relaxation phase) of the heart to distribute and receive blood to and from the body. The heart of a …

Cardiac Muscle Cells

Contractile muscles made from Cardiac Muscle cells • The cardiac muscle cells of the myocardium are arranged in layers that are tightly bound together (form syncytium) and completely encircle the blood-filled chambers. • There are dark areas crossing the cardiac muscle fibres called intercalated discs; they are actually cell membranes that separate individual cardiac muscle …

Cardiovascular System – The Heart

In large, multi cellular organisms, rapid transport of molecules over the long distances between internal cells and the body’s surface, and between the various, specialized tissues and organs is achieved by the circulatory system which includes a pump (the heart) a set of interconnected tubes (blood vessels or vascular system) and a mixture of extracellular …

AIPMT Biotechnology Multiple Choice Questions

Part I 1. The crops having cry genes need (a) no insecticide (b) small amount of insecticide (c) large amount of insecticide (d) none of the above 2. Golden rice is (a) a type of rice grown along the Yellow river in China (b) a transgenic rice having gene for p-carotene (pro-vitamin-A) (c) normal variety …

What happens when you get struck by lightning?

When a human is hit by lightning, part of the strike’s charge flows over the skin – referred to as external flashover – and part of it goes through them internally. The more of the strike that flows through, the more internal damage it causes. The most common organ affected is the heart, with the …

4 Top Issues with Applications of Biotechnology

Following are the issues related to applications of Biotechnology: Ethical Issues: Ethics include a set of standards by which a community regulates its behaviour and decides as to which activity is legitimate and which is not. Therefore, bioethics may be viewed as a set of standards that may be used to regulate our activities in …