pressure differential control

>Any change in the expression of a gene follows an interaction between nucleus, cytoplasm and environment. Cancer is a differentiation related disease. In cancer, the cells continue to divide due to lack of the property of contact inhibition. Cancer is caused by activation of genes called..

. Development involves precisely coordinated series of events. Each gene is switched on in its turn, and then something resulting from the expression of that gene, or some environmental influence, switches on the next gene in the programme. The exact mechanism of differentiation is not fu..

Myogenic mechanism helps to control variations of the blood flow to the glomerulus due to fluctuations in blood pressure. An increase in blood pressure makes the wall of the afferent arteriole contract thus reducing the diameter of the arteriole and increasing the res..

Question: What is the importance of medulla oblongata? Answer: Medulla oblongata has the following functions: 1) It has the cardiovascular centre - It controls the rate and force of heart beat, blood pressure, constriction and dilation of blood vessels. 2) It has the..

Hypothalamus, though a small region situated below the thalamus, is an important region of the brain. It receives the taste and smell impulses, coordinates messages from the autonomous nervous system, controls the heart rate, blood pressure, body temperature and peristalsis. It..

A thistle funnel, covered at the broad end by a differentially permeable membrane, contains a 10% sugar solution. The beaker contains a 5% sugar solution as shown in fig. a. The solute is unable to pass through the membrane, but the water passes freely through in both directions. The net..

In tissue cultures of parenchyma, mitosis is accelerated when both auxin and cytokinin are present, but no response is seen with auxin or cytokinin present alone. Cytokinin - auxin ratio and their interaction controls morphogenetic differentiation in shoot and root meristem..

Question: What is the importance of hypothalamus? Answer: Hypothalamus, a small region situated below the thalamus, is an important region of the brain. It carries out the following important functions: 1) It receives the taste and smell impulses. 2) It coordinates messages from the auto..

Summary - Growth is an irreversible increase in size and weight of an organism. The cells of the body do not grow uniformly but differentially. The main types of growth are auxetic, multiplicative and accretionary. The human growth curve is sigmoid and is controlled by hormones...

Oncogenes - Growth and division of normal cells are regulated by control mechanisms. One such control mechanism is contact inhibition. As a result of multiplication, the cells become crowded and come in contact with one another. This surface contact checks movement and division ..