Warm-Up: January 21, 2011

Which of these biomes is closest to the equator?

a. Taigab. Desertc. Savannad. temperate deciduous forest

Activator

• Has a doctor ever felt your neck or jaw when you were sick. What is the doctor checking for.

EQ - How do the functions of organ systems interact?

TWL

Today I will learn about the lymphatic system because

it helps your body fight pathogens.

Integumentary System

Integumentary System• Is made up of the skin, hair,

and nails.

• Function: it protects your body and helps maintain homeostasis.

Skin• Four functions• Keeps water in the body and

keeps foreign particles out of the body.

• Helps you touch the outside world with nerve endings in the skin

• Helps regulate body temperature through sweat glands

• Helps get rid of waste

Layers of Skin• Epidermis: the outermost

layer of the skin.• Dermis: the thicker layer of

skin that lines beneath the epidermis.

Hair and Nails• Hair: helps protect the skin

from ultraviolet light. It also helps keep particles out of your eyes and nose.

• Nails protect the tips of your fingers and toes.

Skin Injuries• Skin cancer: can be caused

by damage to the genetic material in skin cells.

• Skin may also be affected by hormones that cause oil glands to produce too much oil. The oil, dead skin cells, and bacteria can clog the hair follicles.

Lymphatic System

• The lymphatic system is the group of vessels, organs, and tissues that collects excess fluid and returns it to the blood.

• The lymphatic system also helps your body fight pathogens.

LYMPH CAPILLARIES

• Lymph capillaries absorb some of the fluid and particles from between cells in the body.

• The fluid and particles absorbed into lymph capillaries are called lymph

LYMPHATIC VESSELS

• Lymphatic vessels drain the lymph into large veins in the neck.

• This returns the fluid to the cardiovascular system.

BONE MARROW• Bone marrow is the soft tissue inside bones that makes red and white blood cells.

• White blood cells called lymphocytes help fight infection.

LYMPH NODES

•Lymph nodes are small masses of tissue that remove pathogens and dead cells from the lymph.

THYMUS

•Thymus is a gland that produces T cells that are ready to fight infection.

SPLEEN

• The spleen may release lymphocytes into the bloodstream when there is an infection.

• The spleen also monitors, stores, and destroys old blood cells

TONSILS

• The tonsils are lymphatic tissue at the back of the mouth.

• Tonsils help defend the body against infection by trapping pathogens