
★ Circulation and Excretion Quiz
The basic functional unit of human kidney is
A. Henlé’s loop
B. Nephron
C. Nephridia
D. Pyramid
Select your answer:

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Blood Pressure › ViewArterioles
A. are innervated by parasympathetic nervous system
B. carry blood to the capillaries
C. about 5-8 micrometer
Joints › View
What is the slippery surface that cover the bones?
A. synovial membrane
B. synovial fluid
C. ligament
D. cartilage