Welcome students

Welcome guys :)

In this class we will talk about the heart its function and structure

I will post some exercises, activities and homework so always check this blog for any updates

Hope you'll enjoy this class ;)

Blood Flow In The Heart

What is the heart?

It's an organ that receives blood from coronary vessels and supplies the body organs with oxygenated blood through aorta. At the same time, it carries deoxygenated blood from body parts to the heart through vena cava.

Questions:

1. What does the blue and red color represent?
2. What is the difference between pulmonary artery and aorta?
3. What is the structure that separates between the left and right side of the heart?

References:

Yaghi, M. (2000). Life and earth sciences. Center for educational research and development. Sin-El-Fil, Lebanon.

 

Human Heart. Retrieved July 4, 2011, from http://www.osovo.com/diagram/humanheartdiagram.htm.

Anatomy of the heart

The heart is composed of four chambers: left and right ventricles and left and right atriums (auricles).
The septum divides the right side from the left side.
The heart also contains valves which are one-way valves where the back flow of the blood is prevented.
There are four valves: 2 sigmoids, 1 tricuspid and 1 bicuspid.
The tricuspid valve is between the right atrium and the right ventricle. while the bicuspid valve is between the left atrium and left ventricle.The sigmoid valves are found inside both the pulmonary artery and aorta.
Note: all arteries except the pulmonary artery carries oxygenated blood and all veins except pulmonary vein carries deoxygenated blood.

Questions:

1. What is the special feature of the valves?
2. In the heart, all the arteries carries oxygenated blood except?
3. Locate the places of the valves in the heart.

References:

Yaghi, M. (2000). Life and earth sciences. Sin-El-Fil, Lebanon: Center for educational research and development.

Healthy Heart Cross-Section. Retrieved July 5, 2011, from http://www.nhlbi.nih.gov/health/dci/Diseases/hvd/hvd_whatis.html.

Cardiac Activity

The heart is a muscle that contracts regularly (70 beats/min). these contractions insure that blood is propelled to all body organs. The contraction of the atriums (auricular systole) are rhythmic and simultaneous, so are the contraction of the ventricles (ventricular systole). For each heartbeat, the right ventricle sends blood to the pulmonary artery that carries it to the lungs and the left ventricle sends blood to the aorta that carries it to the organs. After the atrium and ventricle systole, the heart enters in the general diastole phase which is the rest phase.

Questions:

1. What is the normal range of beats per minutes?
2. Which vessel carries oxygenated blood to body organs?
3. Which vessel carries deoxygenated blood to the lungs?

References:

Yaghi, M. (2000). Life and earth sciences. Sin-El-Fil, Lebanon: Center for educational research and development.

HEART. Retrieved July 4, 2011, from http://csm.jmu.edu/biology/danie2jc/heart.htm.