Reptiles

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Reptiles

Reproduction

Development of zygote

Reptiles are oviparous animals, this means that develop inside and egg.

Fertilisation

Reptiles have internal fertilisation, this means that takes place inside the female reproductive system.

Gamete formation

Gametes are formed in the reproductive system called sex organs. Male sex organs are called testes and female ones are called ovaries.

Interaction

Effectors

Muscle fibres contract when they recive an order from the coordination systems. When they contract, they generate movement.

Coordination (The nervous system)

The nervous system is responsible for receiving signals sent by the senses, interpreting them and generating orders to enable coordinated responses.

Receptors

Reptiles have camera-type eye.

Spherical in shape, with receptors cells being located at the rear. They provide clear images of the enviroment

Circulation and excretion

Excretion

They have two kidneys where: 1.- Blood carrying waste reaches the kidney. 2.- The kidney filters the blood, removes the waste and makes urine. 3.- The 'clean' blood leaves the kidney.

Circulation

Reptiles, have a pulmonary circuit, where blood is pumped from the heart to the lungs and back, and a second, systemic circuit where blood is pumped to the body and back.

Respiration

Reptiles breath through lungs.

Lungs are two sponge like organs made up of millions of tiny tubes or cavities (alveoli) with thin walls covered in capillaries, in which gas exchange take place. The cavities of the lungs are connected to the outside of the body through the respiratory tract (the pharynx, the tranchea, the bronchi, etc.)

Nutrition

The process of obtaining nutrients occurs in two stages: feeding and digestion.

Reptiles have digestive system and it's carried out in three stages:

3-. The unusable part of the food is eliminated from the body.

2.- The nutrients are absorbed and transported to the cells.

1.- The food is ground up through mechanical processes, molecules in nutrients are broken down trough

There are two types of feeding (obtaining food) in reptiles, with tongue like iguanas and with teeth like cocodriles.

Characteristics

Their bodies are symmetrical (they are organised in a way that their structures are repeated on either side of an axis or plane).

They are eukaryotic, multicellular organisms they have organs and systems to carry out their vital functions.

Wide variety of shapes, sizes and structures.