Which of the following is attached at bone joints and reduces friction?

a: Decreased osmotic pressure - Decreased osmotic pressure would lead to fluid retention within the capillaries, not lymph production.

b. Increased hydrostatic pressure: Lymph is produced when there is an increase in hydrostatic pressure within the capillaries, which forces fluid and solutes out into the interstitial space, forming lymph.

c: Decreased hydrostatic pressure - Decreased hydrostatic pressure would result in decreased filtration of fluid from the capillaries, hindering lymph production.

d: Increased osmotic pressure - Increased osmotic pressure would draw fluid back into the capillaries, opposing lymph formation.

a: Electrolytes - Electrolytes are ions such as sodium, potassium, and chloride that play essential roles in various physiological processes but are not directly involved in protecting the body from pathogens.

b. Leukocytes: Leukocytes, also known as white blood cells, are involved in the immune response and protect the body from pathogens such as bacteria, viruses, and fungi.

c: Thrombocytes - Thrombocytes, or platelets, are involved in blood clotting but not in protecting the body from pathogens.

d: Erythrocytes - Erythrocytes, or red blood cells, are primarily involved in transporting oxygen and carbon dioxide and do not play a direct role in immune defense.