Blood and Lymph.pdf - 1 Watch the assigned videos before viewing this presentation 2 Watch the assigned videos before viewing this presentation 3 As

Blood and Lymph.pdf - 1 Watch the assigned videos before...

This preview shows page 1 - 7 out of 33 pages.

1
Image of page 1

Subscribe to view the full document.

Watch the assigned videos before viewing this presentation. 2
Image of page 2
Watch the assigned videos before viewing this presentation. 3
Image of page 3

Subscribe to view the full document.

As discussed in the video, blood has three main functions in the body. It transports oxygen from the lungs, nutrients from the digestive tract and hormones from the glands to the cells in the tissue and transports carbon dioxide and metabolic waste from the cells to the kidneys, liver and lungs for removal. The blood is part of the defense system transporting antibodies and cells of the immune system to the site of the infection. The blood also helps to maintain homeostasis by maintaining blood pressure, regulating body temperature and adjusting the pH of the body fluids to keep them within normal limits. Blood is made up of plasma and formed elements. Plasma is 91% water, 7% proteins including albumin, globulin and fibrinogen and 2% other solutes. The formed elements include red blood cells (erythrocytes), white blood cells (leukocytes) and platelets (thrombocytes). The picture on the slide is a hematocrit tube that was filled with whole blood and spun in a centrifuge to separate the components. The plasma is the top portion, the middle white layer called the buffy coat contains white blood cells and platelets and the bottom red layer is the red blood cells. Measuring the percentage of packed red blood cells in the tube is one way of determining an individual’s hematocrit. The hematocrit reference range for healthy adults it 37%-47% for females and 42%-52% for males. Females have lower hematocrits due to the loss of blood each month 4
Image of page 4
during their menstrual cycle. Individuals with anemia have hematocrits below the reference range for their age and gender. Individuals with polycythemia (many cells in blood) have increased hematocrits for their age and gender. The increased number of cells causes the blood to become more viscous (thicker) slowing the flow of blood and oxygen to the tissue. Treatment for polycythemia includes therapeutic phlebotomy removing a unit of blood as needed. Further testing is need to determine the cause of the anemia or polycythemia in order to treat it. 4
Image of page 5

Subscribe to view the full document.

. Hemostasis is our body’s ability to maintain blood in a fluid clot free state in normal blood vessels and form a clot at the site of vascular injury. When a paper cut occurs, the vessel contracts and platelets cover the opening. They secrete a growth factor causing the neighboring tissue cells to divide forcing the platelets out as new tissue fills the opening. When larger cuts occur, a platelet plug forms that must be reinforced by fibrin strands to prevent the clot from being dislodged by the sheer force of the blood before healing has occurred. The fibrin strands are formed by a process called secondary hemostasis which includes the extrinsic, intrinsic and common pathways of the coagulation cascade. Once the tissue has repaired the clot is dissolved by a process called fibrinolysis.
Image of page 6
Image of page 7
  • Summer '15

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes