Circulatory System Flashcards
Whats the main function of the circulatory system?
Transport
What does the circulatory system transport?
Nutrients and water.
Hormones -> cell-cell communication.
Respiratory gases.
Cells -> immunity and repair of injuries.
What does the circulatory system consist of?
A series of tubes (blood vessels) filled with fluid (blood) and connected to a muscular pump (heart).
What ensures continues blood flow through the body?
The heart.
What does the circulatory system work integrated with?
The respiratory system to transport gases through tissues.
What animals lack a circulatory system?
Sponges
Cnidaria
Nemotoda
How do small aquatic invertebrate’s without circulatory systems exchange materials with their enviroment?
Diffusion.
How does gravity affect the circulatory system?
In water blood is weightless and the heart only has to overcome fluid resistance.
On land blood pressure needs to be higher to push blood upwards through veins against gravity.
How does body size affect the circulatory system?
In larger bodies blood has to travel further to reach all cells.
