Human anatomy Exam 4

• Cardiac cycle

  1). Ventricular filling

  • AV valves opened
  • Semilunar valves closed

  
• Cardiac cycle

  2). Atrial contraction

  • AV valves open
  • Semilunar valves closed
  • THINK: wringing the blood out of the atrium like a towel

  
• Cardiac cycle

  3). Isovolumetric contraction

  • AV valves closed
  • Semilunar valves closed
  • Contraction in ventricles; BUT, not enough to open SLV

  
• Cardiac cycle

  4). Ventricular ejection

  • AV valves closed
  • Semilunar valves open
  • BIG contraction in ventricles

  
• Cardiac cycle

  5). Atrial filling

  • AV valves closed
  • Semilunar valves closed

  
• All steps in cardiac cycle

  1). Ventricular filling

  2). Atrial contraction

  3). Isovolumetric contraction

  4). Ventricular ejection

  4). Atrial filling
• Different types of capillaries 


  1). Continuous capillary

  2). Fenestrated capillary

  3). Sinusoid capillary
• Continuous capillary

  • not as permeable, more protected
  • in brain and lungs

  
• Fenestrated capillary

  • known for it‘s pores
  • more permeable
  • found in small intestines

  
• Sinusoid Capillary

  • Major gaps with simple squamous, epithelial cells, + basement membrane
  • SUPER permeable
  • Found in liver, spleen, lymph nodes

  
• Functions of capillaries

  • Site of exchange
  • nutrients (like glucose), gas in between blood and tissue/muscle cells
  • for ex. capillaries can help gas exchange of O2 and CO2 in blood
• Conducting system of heart


  1). SA node

  2). AV node

  3). AV/bundle of HIS

  4). Right and left bundle branches

  5). Purkinje fibers