Which muscle of the quadriceps femoris group lies on the side surface of the lower extremity?

Blood is produced in infants after birth primarily in the red bone marrow. Red bone marrow is a tissue found in the spongy or cancellous portions of bones. It is responsible for hematopoiesis, the process of producing red blood cells, white blood cells, and platelets. In infants, red bone marrow is particularly active and serves as the primary site for blood cell production until later in life when it becomes progressively replaced by yellow bone marrow, which has a greater concentration of fat cells.

The ureter is the structure that conducts urine from the kidney to the urinary bladder. It is a muscular tube that carries urine from the renal pelvis, located in the kidney, to the bladder for storage until it is expelled from the body during urination.

The elbow is a hinge joint. This type of synovial joint allows for movement primarily in one plane, similar to the opening and closing of a door. In the case of the elbow, it permits flexion (bending) and extension (straightening) of the arm.

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Anaerobic respiration can lead to a burning sensation caused by lactic acid. During intense physical activity or when oxygen availability is limited, cells may resort to anaerobic respiration, which involves the breakdown of glucose without the use of oxygen. As a byproduct of this process, pyruvate is converted into lactic acid. Accumulation of lactic acid in the muscles can lead to a burning sensation, muscle fatigue, and discomfort during strenuous exercise. Therefore, the presence of lactic acid is associated with the burning sensation experienced during anaerobic respiration.