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6. When ADH is low, the collecting duct is:
- less permeable to water and a large volume of urine is produced
- more permeable to water and a small volume of urine is produced
- less permeable to water and a small volume of urine is produced
- more permeable to water and a large volume of urine is produced
7. Motor neurons:
- process impulses in the brain and spinal chord; connect sensory an motor neurons
- carry impulses from the central nervous system to effector organs; present in the peripheral nervous system
- carry impulses from the peripheral sensory organs to the central nervous system
8. Glomerular filtrate forms in the:
- renal capsule
- loop of henle
- proximal convoluted tubule
- distal convoluted tubule
9. What part of a neuron carries impulses towards from the cell body?
- Myelin sheath
- Dendrites
- Schwann cells
- Axons
10. The final Na+ reabsorption takes place in the:
- collecting duct
- distal convoluted tubule
- loop of henle
- proximal convoluted tubule
11. The ascending limb of the loop of henle:
- contains Na+ and Cl- pumps and is impermeable to ions
- contains Na+ and Cl- pumps
- contains Na+ and Cl- pumps and is impermeable to water
- is impermeable to water
12. When carbon dioxide levels rise:
- pH falls, breathing rate increases
- pH rises, breathing rate decreases
- pH rises, breathing rate increases
- pH falls, breathing rate decreases
13. The capillary is made up of a single layer, the:
- endothelium
- connective tissue with collagen fibres
- muscle and elastic tissue
14. The right side of the heart contains:
- deoxygenated blood
- oxygenated blood
- both deoxygenated blood and oxygenated blood
15. During ventricular systole and atrial diastole:
- semilunar valves open, aortic valves close
- semilunar and aortic valves close
- aortic valves open, semilunar valves close
- semilunar and aortic valves open
16. Erythrocytes are:
- platelets responsible for blood clotting
- red blood cells responsible for transportation
- white blood cells responsible for immune system regulation
17. The right ventricle pumps blood to the lungs through the
- right atrium
- pulmonary artery
- coronary artery
- pulmonary vein
18. The descending limb of the loop of henle:
- is impermeable to water
- is impermeable to ions
- contains Na+ and Cl- pumps
- causes the filtrate to become less concentrated
19. Blood is made up of 55%:
- liquid plasma
- formed elements
20. During systole, blood vessels: