If false, correct it to make it true. The entrance to capillaries is surrounded by a ring of elastin smooth muscle which can contract to prevent blood flow through the capillary. B. Megakaryocytes are the precursors of lymphocytes . The diaphragm is a skeletal muscle. A person starts to urinate more frequently than usual.
Tests indicate that there is no glucose in the urine.
Urine osmolarity is 200 mOsm. To figure out what's wrong, she refrains from drinking for 24 hours, and again measures urine osmolarity. It is now 300 mOsm. ADH is then injected. Urine osmolarity remains at 300 mOsm.