UNIT 5: THE CIRCULATORY AND THE

EXCRETOR SYSTEM

Conecta el digestivo con el respiratorio y el excretor.

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The main function of the circulatory system is to pump blood carrying oxygen and nutrients around the body.

But how does that oxygen get into the blood in the first place? You may already know that this occurs in the lungs. So the blood must also be pumped to the lungs, and this happens separately from the rest of the body.

CIRCULATORY SYSTEM

● Blood is a fluid connective tissue.● It circulates throughout the body

through blood vessels by the pumping action of the heart.

● Blood carries oxygen and nutrients to all the cells in our body.

● Blood carries carbon dioxide to the lungs to expel it.

● Blood carries waste substances to the excretor system.

● Blood also defends the body against infection, repairs body tissues, transports hormones, and controls the body’s pH.

BLOOD

TIPOS SANGUINEOS ABO

Blood vessels form a network throughout the body to transport blood to all the body cells.

There are three major types of blood vessels: arteries, veins, and capillaries.

BLOOD VESSELS

TIPOS DE VASOS SANGUÍNEOS

THE HEART

The heart has four chambers: two upper atria and two lower ventricles.

DIÁSTOLE SÍSTOLE

BLOOD PRESSUREBlood pressure occurs when circulating blood puts pressure on the walls of blood vessels.

Healthy Blood Pressure Ranges

Blood pressure is read as two numbers:● The first number is the systolic pressure. It is the

pressure on the blood vessels when the heart beats. This is the time when there is the highest pressure in the arteries.

● The diastolic pressure, which is the second number, is when your blood pressure is lowest, when the heart is resting between beats.

Healthy ranges for blood pressure are:

● Systolic: less than 120● Diastolic: less than 80

Dos circuitos:

● Pulmonar: lleva la sangre del corazón a los pulmones donde se carga de oxígeno (se oxigena) y la lleva de nuevo al corazón.

● General: llevan sangre oxigenada desde el corazón a todo el cuerpo y la devuelve al corazón.

CIRCULACIÓN SANGUÍNEA

PULMONARY CIRCULATION

The pulmonary circulation carries blood between the heart and lungs.

SYSTEMIC CIRCULATION

The systemic circulation carries blood between the heart and body.

CIRCULACIÓN SANGUÍNEA POR LAS VENAS

● Es una red de vasos linfáticos que transportan plasma intersticial (linfa) por el organismo.

● Filtra y limpia el plasma intersticial.● Formado por:

THE LYMPHATIC SYSTEM

● Vasos linfáticos: los capilares linfáticos están en tejidos, se unen en venas linfáticas que desembocan en las venas sanguíneas. Intercambian sustancias con sangre y plasma intersticial.

● Ganglios linfáticos: órganos que se encuentran en el recorrido de los vasos linfáticos. Liberan linfocitos al plasma linfático.