Aim How does the human circulatory system function

Aim: How does the human circulatory system function to maintain body homeostasis? DO NOW Directions: State whether the following quotes are true or false & explain why. 1. “The heart pumps oxygen to the brain” 2. “Oxygen diffuses into and out of the heart”

Circulatory System • Includes: blood, blood vessels & heart • Function: to transport dissolved material (glucose, oxygen, amino acids) to all parts of the body & carry and take away wastes & carbon dioxide

Blood • Liquid medium inside our body • Transports nutrients, gases, hormones, antibodies • Regulates temperature • Consists of: red blood cells, white blood cells, platelets, plasma

Red Blood Cells • Transport oxygen & carbon dioxide • On surface: hemoglobin protein • Concave shape

White Blood Cells • Fight disease in the body (defenders) • Make antibodies • Many different types

Platelets • Involved in blood clotting • helps healing

Plasma • Liquid part of the blood • Clear, strawcolored liquid • Largest component of blood

Blood Vessels • Three types • Arteries: carry oxygenated or oxygen-rich blood away from the heart – Have thick walls – Transport blood at high pressure – Pulse rate can be calculated from artery • Veins: carry deoxygenated or oxygen-poor blood toward the heart – Thinner walls – Transport blood at low pressure • Capillaries: smallest & connect arteries & veins – Diffusion of oxygen & carbon dioxide occurs here

Blood Vessels Visual

Heart • • • 4 chambers 2 Upper chambers: atria (plural) 2 Lower chambers: ventricles 2 sides: left & right Right side carries oxygen-poor blood – Blood from this side will go to LUNGS to pick up oxygen • Left side carries oxygen-rich blood – Blood from this side will go to BODY

Heart Image

Heart Image

Gas Exchange • LUNGS: where gas exchange happens • Diffusion occurs between capillaries & blood • Oxygen enters blood & gets transported back to heart • Carbon dioxide will leave blood & be exhaled out of the body

Blood Circulation

AORTA • Largest artery in the body • transports oxygen rich blood to BODY

Video • http: //studyjams. scholastic. com/studyjams/ja ms/science/human-body/circulatorysystem. htm • https: //www. brainpop. com/health/bodysyste ms/circulatorysystem/

Video Quiz • http: //studyjams. scholastic. com/studyjams/ja ms/science/human-body/circulatorysystem. htm

School-House Rock –Circulation Song • https: //www. youtube. com/watch? v=5 t. Tkx. Ye NF 9 Q

Group Activity Directions: In pairs, answer the following questions. 1. What other major body system does the circulatory system work with & how do they work together? 2. How does the human circulatory system maintain body homeostasis?

Individual Activity Directions: Answer the following question & submit! Q: The general pathway of blood in the body is A. heart lungs body heart B. body lungs heart body C. lungs heart lungs body D. heart lungs heart body

Homework • Read txt. pgs. 582 -589 • Answer questions 1, 3 & 5 on pg. 589