bio lab 404

Answers to Study Guide:

The Heart

Chambers:

  • Right atrium: Receives deoxygenated blood from the body through the superior and inferior vena cava.

  • Right ventricle: Pumps deoxygenated blood to the lungs through the pulmonary artery.

  • Left atrium: Receives oxygenated blood from the lungs through the pulmonary vein.

  • Left ventricle: Pumps oxygenated blood to the body through the aorta.

Valves:

  • Tricuspid valve: Prevents blood from flowing back from the right ventricle to the right atrium.

  • Pulmonary valve: Prevents blood from flowing back from the pulmonary artery to the right ventricle.

  • Mitral valve: Prevents blood from flowing back from the left ventricle to the left atrium.

  • Aortic valve: Prevents blood from flowing back from the aorta to the left ventricle.

Major Vessels:

  • Vena cava: Carries deoxygenated blood from the body to the right atrium.

  • Pulmonary artery: Carries deoxygenated blood from the right ventricle to the lungs.

  • Aorta: Carries oxygenated blood from the left ventricle to the body.

  • Pulmonary vein: Carries oxygenated blood from the lungs to the left atrium.

The Respiratory System

Lungs:

  • Right lung: Has two lobes, the upper and lower lobes.

  • Left lung: Has three lobes, the upper, lower, and lingula.

Alveoli: Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged between the blood and the air.

Diaphragm: A dome-shaped muscle that separates the chest cavity from the abdominal cavity. It contracts to help inhale by increasing the volume of the chest cavity, and relaxes to help exhale.

Muscles

Skeletal muscles: Attach to bones and are responsible for voluntary movement. Examples include biceps, triceps, and quadriceps.

Smooth muscles: Found in the walls of organs and are responsible for involuntary movements. Examples include muscles in the digestive system and blood vessels.

Cardiac muscle: Makes up the heart and is responsible for pumping blood throughout the body. It contracts and relaxes rhythmically.

Circulation

Pulmonary circulation: The circulation of blood between the heart and the lungs. It carries deoxygenated blood from the right ventricle to the lungs, where it picks up oxygen and becomes oxygenated. Then, it carries oxygenated blood from the lungs to the left atrium.

Systemic circulation: The circulation of blood between the heart and the rest of the body. It carries oxygenated blood from the left ventricle to the body, where it delivers oxygen to tissues and removes carbon dioxide. Then, it carries deoxygenated blood back to the right atrium through the vena cava.

Additional Topics

Histaminic circulation:

  • This term is not commonly used in anatomy and seems to be a misspelling of "histamine circulation."

  • Histamine is a chemical released by the immune system in response to allergic reactions and other stimuli. It causes various effects, including bronchoconstriction, vasodilation, and increased mucus production.

  • Histamine circulation is not a specific anatomical pathway, but rather refers to the distribution and effects of histamine throughout the body.

Sestimic circulation:

  • This term is not a recognized anatomical term.

  • It is possible that it is a misspelling of "systemic circulation."

  • If you have further information about this term, please provide it for further clarification.

I hope these answers are helpful and provide you with a comprehensive understanding of the topics covered in your notes. Please let me know if you have any further questions.