Histology-Fall11 Blood Vascular and Immune Systems

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    • Characteristics:
    • Elastic tissue is colored blue and consists of adventia, collagen is pale pink and cytoplasm (in
    • smooth muscle and nerve) is red and consists of tunica media and the innermost layer, tunica intima is closest to the lumen.

    • Function:
    • Protection to arterial walls, help in contraction and relaxation, controls blood pressure

    • Location:
    • Human Cardiovascular System
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    • Characteristics:
    • Peripheral arteries, veins, and nerves tend to travel and branch in parallel.

    • Function:
    • All three have different functions towards the human body.
    • Artery
    • Supply oxygenated blood
    • Vein
    • Collects deoxygenated blood
    • Nerve
    • Conducts impulses from the brain/spinal cord to receptor organs as well as conducting impulses from the receptor organs back to the brain/spinal cord.

    • Location:
    • Human organ system
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    • Function:
    • Immunity by attaching foreign agents

    • Characteristics:
    • Diffuse lymphoid tissues (lymphoid nodule) composed of lymphocytes

    • Location:
    • Found along the intestinal wall with higher amounts in the ileum and appendix
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    • Characteristics:
    • A lymph node is round, ovoid, or bean-shaped and varies in size from less than 1 mm to 2-3 cm. Lymph nodes may enlarge during infection or disease and then they are easily palpated.

    • Function:
    • Lymph nodes produce lymphocytes and antibodies, filter the lymph (remove dead bacteria and other foreign bodies), serve as a defense mechanism to prevent the spread of malignant cells, and represent potential hemopoietic organs.

    • Location:
    • Found along the course of blood vessels, often at the flexor aspects of joints (e.g., inguinal, popliteal, and axillary lymph nodes).
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    • THYMUS
    • Characteristics:
    • Thymus is a bilobed mass of lymphatic tissue. It reaches its greatest relative weight (10-15 g) at birth and its greatest absolute weight (30-40 g) about the time of puberty. It begins to involute after puberty (weighing about 25 g at 25 years, 13 g at 50 years, and 6 g at 75 years) and may become difficult to recognize grossly because of fatty infiltration. Gonads, suprarenal glands, and the thyroid gland influence the thymus.

    • Function:
    • Maturation site for T cells

    • Location:
    • Found close to vessels at the base of heart.
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    • Characteristics:
    • Top layer of the tonsil consists of stratified Squamous epithelium followed by lymphatic tissue.
    • Function:
    • Helps in local immunity and cytokine action.

    • Location:
    • These are the tonsils that can be seen on the left and right sides at the back of the throat.
Card Set:
Histology-Fall11 Blood Vascular and Immune Systems
2011-10-28 05:26:36
histology lab blood vascular immune system

histology lab blood vascular and immune system
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