1.SENSE ORGANS • Stimuli: changes that occur in our internal and external environment. • Sensory receptors: specialised structures that detect stimuli and generate nerve impulses. • Depending on their location internal or external in the body can be: • Interoceptor: distributed throughout the inside of the body, detect changes such as variations in blood oxigen levels or blood pressure. • Exteroceptors: near the surface of the body, detect changes in the external environment ex. T or light.

THE LYMPHATIC SYSTEM

Is involved in the function of exchanging substances between the circulatory system and the cells. 

The lymphatic system collects the excess of interstitial fluid that remains between the cells and returning it to the blood. It also transports fats that are absorbed in the intestine, and takes part in the body’s defence system. 

Functions

Return excess interstitial fluid to the blood​

Transport absorbed fat from the small intestine to the blood​

Take park in the body’s defence

The interaction function enables people to perceive changes and stimuli that occur both inside their bodies and in their environment, to interpret or process them and generate coordinated responses in order to survive.

A stimulus is a physical or chemical change that takes place outside or inside the body and triggers a response in it.

Our bodies contain a series of specialist cells, called receptors, which perceive stimuli and send the information they detect to the coordination centres for processing.

 theori about origin of life

Theory of spontaneous generation (Aristotle)

–Formerly it was believed that decomposing organic matter produced living beings spontaneously

Theory of prebiotic synthesis (Alexander O, John H)

–Life arose from inorganic matter

Panspermia theory

–Proposed by SvanteArrhenius

–Suggests that life came to earth from another planet–It does not solve the question posed by the origin of the first living being

Present-day hypothesis

–Possible appearance of living beings in

SALES AND MARKETING FUNCTIONS:  includes all activities necessary to bring consumers the goods or services produced by the company, thus satisfying their needs and trying to achieve the best results. (a product is sold if there is a good marketing policy that publicizes and makes it desirable.Duties of the sales and marketing department: planning and control, market research, product promotion and advertising, sales.THE MARKET: is defined as a set of purchasing and sales activities of a product