Biology 100: Discoveries in Biology - Cardiovascular System

Relaxation of heart muscles and blood flowing into the atria

Valves close to prevent backward blood flow, ventricles contract to push blood out of the heart, atria relax and refill with blood.

The atria contract, and valves open to allow blood into the ventricles.

<p>Blood pressure is the force of blood on artery walls, measured as systolic pressure/diastolic pressure (e.g., 120/80).</p> Signup and view all the answers

<p>Stimulates the production of red blood cells in bone marrow</p> Signup and view all the answers

<p>They 'eat' microorganisms and digest them.</p> Signup and view all the answers

<p>Platelets produce tiny fibrinogen fibers to form a net that traps other blood cells.</p> Signup and view all the answers

<p>Carbon dioxide, glucose, amino acids, proteins, minerals, vitamins, hormones, waste materials like urea</p> Signup and view all the answers

<p>Form a net to trap other blood cells and create a blood clot</p> Signup and view all the answers

<p>Consists of two pumps: one for pulmonary circulation to the lungs, and one for systemic circulation to the body's tissues</p> Signup and view all the answers

<p>To circulate blood uni-directionally from the heart around circulatory routes and return to the heart again, keeping it largely separated from the interstitial fluid.</p> Signup and view all the answers

<p>Biconcave disc; contain haemoglobin, a molecule designed to hold oxygen and carry it to cells.</p> Signup and view all the answers

<p>A complex protein made up of four protein strands, plus iron-rich heme groups; can carry four oxygen atoms.</p> Signup and view all the answers

<p>It is recycled in the liver and spleen.</p> Signup and view all the answers

<p>To hold oxygen and carry it to cells that need it.</p> Signup and view all the answers

<p>The circulatory system is a closed-loop system where blood is largely separated from the interstitial fluid.</p> Signup and view all the answers