The The CirculatoCirculato

ry ry SystemSystem

Unit 1-7 NotesMr. Hefti – Pulaski

Biology

Circulatory System Fun FactsCirculatory System Fun Facts1. It takes 20 seconds for blood to circulate the entire body.

Oxygenated blood leaves the aorta at a rate of about 1 mile an hour.

2. The power output of the heart ranges from 1-5 watts per minute. This is the equivalent to the usage of a 60 watt bulb. It has been said that enough energy is produced a day to drive a truck 20 miles.

3. “Ventricle” means “little belly” in Latin where as “Atrium” is Latin for “entrance hall”.

4. Red blood cells live for up to 4 months and make approximately 250,000 round trips around the body before returning to the bone marrow, where they were born to be recycled. Between 2.5 and 3 million red blood cells (erythrocytes) are lost and replaced every second.

A. Components of BloodA. Components of Blood

1. Plasma makes up about Plasma makes up about 55%55% of the total of the total volume of blood. It consists of about 90% volume of blood. It consists of about 90% water and 10% solutes (metabolites, water and 10% solutes (metabolites, wastes, salts, proteins)wastes, salts, proteins)

2.2. Red blood cells (rbc’s)Red blood cells (rbc’s)

- Carry oxygen - Carry oxygen

3.3. White blood cells (wbc’s)White blood cells (wbc’s)

- Fight disease- Fight disease

4.4. PlateletsPlatelets

- Heal damaged vessels- Heal damaged vessels

Vessel type

Direction of blood flow

Properties of blood

Relative size

Blood pressure

Elasticity

Artery Away from heart

O2 rich Large High High

Capillary Transition: away from

heart to toward heart

Transition: from O2 rich

to CO2 rich

Extra small

Medium Low

Vein Toward heart

CO2 rich Medium Low Low

B. Characteristics of Blood VesselsB. Characteristics of Blood Vessels

Bicuspid valve

Semilunar valve

Tricuspid valve

Semilunar valve

Right ventricle

Left ventricle

Right atrium

Left atrium

AortaVena cava

Vena cava

Pulmonary veinPulmonary

vein

Pulmonary artery

Pulmonary artery

C. The Heart

Septum

D. What does the circulatory system transport…D. What does the circulatory system transport…

• from the digestive system?

- nutrients• from the respiratory system?

- O2 and CO2• from the excretory system?

- wastes• from the endocrine system?

- hormones• in order to maintain constant body temperature?

- heatheat

Make connections…Make connections…• Which organelle has a similar job to do?Which organelle has a similar job to do?

– Endoplasmic reticula (transport channels)

• What is the link between the circulatory What is the link between the circulatory system and the respiratory system and the system and the respiratory system and the digestive system?digestive system?– The circulatory system transports materials prepared

by both organ systems