- cold blooded
- blood is low in red blood cells
- they don't require oxygen to heat bodies
- blood is caried through veins and arteries linking various organs to the lungs and the heart
- 3 chambered heart
- In the heart there is a venous and arterial blood mix that limits the amount of oxygenated blood reaching organs
Thursday, January 5, 2012
Circulatory System
Circulatory System
Subscribe to:
Post Comments (Atom)
Blood Vessels
ReplyDelete• Blood vessels are intricate networks of hollow tubes that transport blood through the entire body.
• Blood vessels (except capillaries) are made up of three layers – tunica externa, tunica media and tunica interna, surrounding the central blood carrying canal (known as lumen).
– The tunica externa or tunica adventitia, strong outer covering of arteries and veins is composed of connective tissue as well as collagen and elastic fibres. These fibres allow the arteries and veins to stretch to prevent over expansion due to the pressure that is exerted on the walls by blood flow.
– The tunica media is the middle layer of the walls of arteries and veins. It is composed of smooth muscle and elastic fibres. This layer is thicker in arteries than in veins.
– The tunica intima is the inner layer of arteries and veins. In arteries this layer is composed of anelastic membrane lining and smooth endothelium that is covered by elastic tissues.
Reading more
Casino Tycoon Slot Game - Mapyro
ReplyDeleteFind out how and when 광주광역 출장안마 to 경상남도 출장마사지 play Casino Tycoon 서귀포 출장마사지 Slot Game in Maricopa, AZ, including real player reviews, screenshots, 777 Casino 하남 출장마사지 Way 전라남도 출장샵 Maricopa, AZ 85139.