Which of the major hormone types bind to receptors on target cells?

In which organ system is fluid continuously made anew, rather than reused?

Which side of the heart features the SA node?

Which of the following nourishes sperm?

In which of the following is the glans comprised of corpora cavernosa?

List three features of erythrocytes that make them  ideal  for efficient gas transport.

Place the following events in order.  WRITE OUT THE LETTERS!!    D. zona glomerulosa targeted    F. blood pressure drops below homeostatic norm    J. angiotensinogen converted into angiotensin II    K. tubule cells at distal end of nephrons targeted    M. granular cells secrete renin    P. adrenal cortex secretes aldosterone    R. newly installed ion channels reabsorb sodium/secrete potassium

Which of the following best describes the position of the thymus relative to the heart?

Name the structure at “A”.

What part of the nephron is impermeable to water transport?