In brief, personality is a comprehensive concept that give importance on the growth and behaviour of the child as an organised whole. Biological Factors: The biological factors are of biogenic by nature and include those of heredity, endocrine glands, physique and physical condition, nervous system, etc.

A heritability close to one indicates that almost all of the variability in a trait comes from genetic differences, with very little contribution from environmental factors. Heritability does not indicate what proportion of a trait is determined by genes and what proportion is determined by environment.

Internal and external environmental factors, like gender and temperature, influence gene expression. Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.

Explanation: Environmental factors influence traits in plants and animals. These traits include things like weight, height, size, and color. If a child does not get proper nutrition, their height may be stunted as an adult.

The environment can influence peoples’ behavior and motivation to act. The environment can influence mood. For example, the results of several research studies reveal that rooms with bright light, both natural and artificial, can improve health outcomes such as depression, agitation, and sleep.

Ultimately, Avinun found no links between the Big Five personality traits and multiple features of brain structure. “The brain is plastic and it is affected every day by our experiences, so expecting to find straightforward associations between brain morphometry and personality traits may be too naïve,” Avinun said.

Stress and your heart These hormones include cortisol and adrenaline. They prepare your body to deal with stress. They cause your heart to beat more rapidly and your blood vessels to narrow to help push blood to the center of the body. The hormones also increase your blood pressure and blood sugar levels.

And strong emotions, such as anger, may cause irregular heart rhythms. Stress can be harmful to your heart, too. If you are under stress, your blood pressure and heart rate go up.

Emotions such as anger and hostility ramp up your “fight or flight” response. When that happens, stress hormones, including adrenaline and cortisol, speed up your heart rate and breathing. You get a burst of energy. Your blood vessels tighten.

In the early stages of love — lust and attraction — adrenaline and norepinephrine make the heart beat faster so you may find your pulse racing when just thinking about the object of your affection or whenever that person is near. Dopamine induces euphoria.

When you kiss someone, your brain conveys signals to the adrenal gland that in return releases hormones like adrenaline, epinephrine and norepinephrine. These hormones pass through the blood and triggers your heart to beat faster and also sends more blood to your brain.