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, straw- colored 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

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 ms/science/human-body/circulatory- system.htm ms/science/human-body/circulatory- system.htm ms/circulatorysystem/ ms/circulatorysystem/

Video Quiz ms/science/human-body/circulatory- system.htm ms/science/human-body/circulatory- system.htm

School-House Rock –Circulation Song F9Q F9Q

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 Answer questions 1,3 & 5 on pg. 589