INTRODUCTION

We are a group of first-year students of that from the Cristóbal Colón school who have created this blog to teach you all the functions of living beings. We would be delighted to receive comments and resolve all the doubts that arise from our posts.

FERTILIZATION. EMBRYONIC AND POST-EMBRYONIC DEVELOPMENT

 Fertilization is the fusion of gametes: and ovum and a sperm. When the nuclei of the ovum and sperm combine, they form a zygote.

REPRODUCTION

 REPRODUCTION

Reproduction is the biological process which produces new individual organisms.It guarantees that the species will continue to exist.Living things,progenitors ,are able to multiply and generate new living things called young or descendants.

THE MUSCULOSKELETAL SYSTEM

Animals often respond to a stimulus with movement, which is made possible by the musculoeskeletal system. Movement can take place without changing position, like closing eyelids, or it can lead to a change in position, like flying. This system consists of two structures: the skeleton and the muscles.

3.THE CIRCULATORY SYSTEM

• Animals transport  the gases and nutients in the circulatory system .This system comsist of several element :

1. Circulatory liquid. It transport oxygen and nutriends to the cells and  to the  body ,and carried  carbon dioxide and other waste products .In vertebrates , this liquid  is called blood and is red .In the molluscs and arthropods  this liquid is a colourless fluid called hemolymph.
2. blood vessels :these tube carried blood

• Arteries carry blood away from the heart

1. Veins carry blood back to the heart 
2. capillares are tiny blood vessel than exchange subtances

• heart is a organ and poomp bloodare
•      2 tipes of circulatory systems

1. open is tipical of mollusc and arthropods
2. close  thy type is tipical    of aracnids

7.THE NERVOUS SYSTEM

Neurons are similar in all animal vary in complexity .More complex organisms have  complex nervous systems and more neurons  enables faster  complex precise behaviour 

SYSTEMS OF COORDINATION

Animals have two systems for coordinanting and regulating their life functions:the two work closely together.

Nervous system.Consists of specialized cells called neurons.Neurons transmit information as nerve impulses.The impulses travel along the branches of the neuron which form cords called nerves.

THE FUNCTION OF INTERACTION: RECEPTORS

Interaction is the life function which enables living things to capture information called stimuli. The stimuli lead to a response in the living thing. Produce a response, several different structures are necessary.

THE EXCRETORY SYSTEM

 In animals, the metabolism of nutrients produces a series of waste substances. Can be toxic if levels become high. The main waste products are carbon dioxide, ammonia, urea, uric acid, mineral salts and water. Other substances are eliminated by the excretory system.

THE CIRCULATORY SYSTEM

 In animals, transport of gases and nutrients is carried out by the circulatory system. Consists of several elements:

TYPES OF RESPIRATORY SYSTEMS

Animals take oxygen from their enviroment and transport it to the cells.The entire process is called cellular respiration,carbon dioxide is produced as a waste product and is expelled outside the cell.

External respiration is the process of breathing.Animals inhale oxygen from the enviroment and exhale carbon dioxide.

NUTRITION AND DIGESTIVE PROCESS

Animals are classified as heterotrophs. They cannot make their own food. They need to feed on other organisms.

Heterotrophic nutrition, organic substances are obtained from the plants and animals. Converted into matter and energy.