Need help with my quiz, just need the correct answer no explantation needed. Thank you!

Question 1 (2.5 points)
For distant vision the muscles of the iris will ________.
Question 1 options:
A. remain unchanged
B. constrict
C. relax

Question 2 (2.5 points)
What is a relationship among leukocytes and erythrocytes?
Question 2 options:
A. leukocytes phagocytize erythrocyte
B. both leukocytes and erythrocytes circulate for approximately three months
C. leukocytes produce ATP needed by erythrocytes to function
D. leukocytes numbers is inversely related to erythrocytes numbers

Question 3 (2.5 points) 
Oxygen diffuses from blood into tissues because
Question 3 options:
A. oxygen concentration in tissue is lower
B. oxygen concentration in tissue is higher
C. carbon dioxide concentration in tissue is higher
D. carbon dioxide concentration in tissue is lower

Question 4 (2.5 points) 
In a frog, ____ supplies the body tissues, and ____supplies the respiratory surfaces.
Question 4 options:
A. pulmonary circulation; systemic circulation
B. pulmonary circulation; pulmocutaneous circulation
C. systemic circulation; pulmocutaneous circulation
D. systemic circulation; pulmonary circulation
E. pulmocutaneous circulation; systemic circulation
 

Question 5 (2.5 points) 
For decades, people have been told to cut down on salt to reduce blood pressure. What unexpected consequence may arise from people following this advice too strictly?
Question 5 options:
A. hypothyroidism due to lack of iodine
B. hypoglycemia due to lack of iodine
C. hyperthyroidism due to lack of iodine
D. hyperglycemia due to lack of sodium
E. hypothyroidism due to lack of sodium

Question 6 (2.5 points)
Hemoglobin that releases oxygen will
 

Question 6 options:
A. have a high affinity for more oxygen
B. have a high affinity for carbon dioxide
C. dissolves in the plasma
D. will release an alpha and a beta subunit

Question 7 (2.5 points) 
Place the events at the neuromuscular junction (NMJ) in the order in which they occur:
1. release of acetylcholine (ACh)
2. activation of ACh receptors on motor endplate
3. termination of ACh activity by acetylcholinesterase (AChE)
4. arrival of an action potential at the synaptic end bulb
5.diffusion of ACh across the synaptic cleft
6. opening of Na+ channels in the motor endplate
7. production of muscle fiber action potential
 

Question 7 options:
A. 4,1,2,5,6,7,3
B. 4,1,7,6,2,5,3
C. 4,1,5,2,6,7,3
D. 4,1,5,2,7,6,3
E. 4,1,5,2,3,7,6

Question 8 (2.5 points) 
When there are high levels of insulin, hormone receptors undergo endocytosis gradually reducing their quantities. This is an example of
Question 8 options:
A. up-regulation
B. down-regulation
C. facilitated diffusion
D. intracellular binding to receptors

Question 9 (2.5 points) 
Why are gills in fish efficient?
Question 9 options:
A. the high surface area created by folds of gills
B. the flow of water over them
C. continuous diffusion of oxygen into the blood vessels
D. respiration is independent of the circulatory system
E. the temperature difference between the water and the fishes gills

Question 10 (2.5 points) 
________ is released from the anterior pituitary gland. It stimulates spermatogenesis in testes, and ovarian follicles to grow and produce estrogen.
Question 10 options:
A. Luteinizing hormone (LH)
B. Follicle-stimulating hormone (FSH)
C. Inhibin
D. Progesteron
E. Gonadotropin-releasing hormone (GnRH)