Which blood type is considered the universal donor?
Blood type O negative is considered the universal donor because it can be transfused to patients of any blood type. This is due to the absence of A and B antigens on the surface of red blood cells, which reduces the risk of an immune reaction. However, type O negative individuals can only receive blood from other O negative donors. Universal donors are crucial in emergency situations where there may not be time to determine the recipient's blood type. Type AB positive is considered the universal recipient because individuals with this blood type can receive red blood cells from any blood type.
The process by which cells divide to form two identical daughter cells is called:
Mitosis is the process of cell division that results in two genetically identical daughter cells from a single parent cell. It is essential for growth, development, and tissue repair in multicellular organisms. Mitosis consists of several stages: prophase, metaphase, anaphase, and telophase, followed by cytokinesis, which divides the cytoplasm and organelles into two daughter cells. Unlike meiosis, which produces four genetically diverse gametes (sperm or egg cells), mitosis ensures that each daughter cell receives an identical set of chromosomes.
Which type of joint is found in the shoulder and hip, allowing for a wide range of movement?
Ball and socket joints, like those in the shoulder (glenohumeral joint) and hip (acetabulofemoral joint), allow for rotational movement and a wide range of motion in multiple directions. These joints consist of a spherical head (ball) that fits into a cup-like cavity (socket). The design of ball and socket joints permits movements such as flexion, extension, abduction, adduction, and rotation. This extensive range of motion makes them critical for various daily activities and athletic movements.
The medical term for high blood sugar is:
Hyperglycemia refers to elevated levels of glucose in the blood, commonly associated with diabetes mellitus. It occurs when the body does not produce enough insulin or cannot effectively use the insulin it produces. Symptoms of hyperglycemia include increased thirst, frequent urination, fatigue, and blurred vision. Chronic hyperglycemia can lead to serious complications such as cardiovascular disease, nerve damage, kidney failure, and retinopathy. Management of blood glucose levels is crucial for individuals with diabetes to prevent these complications.
Which of the following cells are part of the body's immune system and help fight infections?
Leukocytes, or white blood cells (WBCs), are crucial components of the immune system, protecting the body against infections and foreign invaders. There are several types of leukocytes, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with specific functions in the immune response. Neutrophils, for example, are the first responders to bacterial infections, while lymphocytes (such as T cells and B cells) are involved in adaptive immunity. Thrombocytes (platelets) are involved in blood clotting, erythrocytes (red blood cells) carry oxygen, and osteocytes are bone cells.
