Tissues Epithelial and Blood

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Section 10.2

• Tissues- Epithelial and Blood

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Tissues

• Groups of cells that have a similar function
• 5 types
• Epithelial
• Blood
• Connective
• Muscle
• Nervous

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Epithelial Tissue

• Small flat cells- tightly packed
• Protects your body
• Covers outside of body- outer portion of skin
• Covers many cavities- spaces inside the bodys
  digestive and respiratory systems
• Protects the body from injuries, H2O loss, germs
• Grows with body

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More Epithelial Tissue

• We loose millions every day
• 75 of house dust is epithelial skin

• Helps control temperature
• Pores allow skin to sweat and release heat
• Epithelial tissue has many functions
• In digestive system, produces mucous
• In lungs, traps dust to clean lungs

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Blood Tissue

• Bodys transportation system
• Carries heat, gases, minerals, wastes, food,
  hormones, and disease fighting chemicals.

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Parts of Blood

• 1. Plasma- clear, yellowish liquid
• Carries food to cells
• Carries waste to kidneys
• Helps to form blood clots

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Parts of Blood

• 2. Platelets- small pieces of cells without a
  nucleus

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Parts of Blood

• 3. Red Blood Cells (RBC)- gives blood its color
• Carries oxygen to body
• Contain hemoglobin- protein that allows RBC to
  carry oxygen
• Carries CO2 back to lungs to be released
• RBC does not have a nucleus
• RBC does not live long
• New RBC made in bone marrow.

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Parts of Blood

• 4. White Blood Cells (WBC)- colorless cells
• Less numerous than RBC
• Play a role in fighting infection
• Some WBC engulf invading bacteria
• Some WBC produce antibodies- chemicals that kill
  the foreign bacteria
• Dead WBC form pus at the site of infection

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Donating Blood

• Must be 17 years old and weigh at least 110
  pounds.
• Take medical history and temperature, pulse,
  blood pressure and weight.
• Small amount of blood will be tested to make sure
  that there are enough RBC or hemoglobin in blood
• Takes about 10 minutes to donate.
• Red Cross tests blood before it is given to
  someone else