Lecture 9: Circulatory Systems

<p>Thinner tunica media and valves to prevent backflow with lower pressure. (B)</p> Signup and view all the answers

<p>Little tunica externa and high resistance, for blood flow regulation. (D)</p> Signup and view all the answers

<p>Interstitial fluid (D)</p> Signup and view all the answers

<p>Generating pressure to move fluid (C)</p> Signup and view all the answers

<p>Fluid leaves discrete vessels and bathes tissue cells directly (D)</p> Signup and view all the answers

<p>Sinuses (B)</p> Signup and view all the answers

<p>Simple system where body movements aid circulation (A)</p> Signup and view all the answers

<p>It is always an open system but varies in complexity (A)</p> Signup and view all the answers

<p>They are a network of spaces that allow hemolymph to circulate among cells (D)</p> Signup and view all the answers

<p>To exchange substances while staying within the animal tissues (C)</p> Signup and view all the answers

The lining of blood vessels that allows for exchange of substances, regulates blood clotting, and contributes to blood pressure control.

The middle layer of blood vessels, composed of smooth muscle and elastin, playing a crucial role in regulating blood pressure and flow.

The outermost layer of blood vessels, mostly made of collagen, providing structural support and flexibility.

Arteries near the heart are more elastic, allowing them to expand under high pressure, acting as a 'pressure reservoir'.

Arteries further away from the heart, with thicker muscle layers, contribute to controlling blood flow.

A substance that can flow and change shape readily. In animals, this includes blood, hemolymph, and lymph.

The process of moving fluids throughout an organism. It involves the movement of blood, hemolymph, or lymph.

A system that includes pumps, tubes, and internal fluid to transport substances throughout an organism.

Part of a circulatory system that generates pressure to move fluid through the tubes.

Tubes that carry fluids throughout the circulatory system.

Fluid that circulates within the body and exchanges materials with the external environment.

A circulatory system where the circulating fluid is enclosed within a system of vessels, separating it from the tissues.

A circulatory system where the circulating fluid leaves discrete vessels and directly bathes the tissue cells.