The substance found inside the irregularly-shaped structures shown below, and from which thyroid hormones are ultimately formed, is called _________.  

In which skeletal muscle phenomenon would you expect to find an optimal length?

The __________ are responsible for producing the fluid that lubricates the urethra prior to ejaculation. 

Which of the following is false regarding the male reproductive system?    a. Inhibin selectively inhibits FSH secretion.    b. FSH receptors are found primarily within the seminiferous tubule.    c. Testosterone influences secondary sex characteristics.    d. GnRH stimulates the release of FSH.    e. Epididymis is a site of sperm maturation.    f. Two of those mentioned above are false.    g. None of those mentioned above is false.

The type of contraction that occurs when a weightlifter holds a dumbbell in his/her outstretched arm is called an _______ contraction.

Cryptorchidism refers to the failure of the testes to move into the _________.

Based on what you know about the likely content(s) of the contraceptive birth control pill, briefly explain how it regulates ovulation (or lack thereof) by a negative feedback process.

The band that contains actin and spans two sarcomeres is the _______ band.  You can just write the letter of the band.

Write out the HPG axis for the human female specifically. Include all relevant anatomical structures, all relevant hormones involved.  Spell out all hormones in the axis.  You can write the axis as a flow chart if you would like.  Also, write out one example of a long negative feedback loop and one example of an ultra-short negative feedback loop.  For the feedback loops, just state which specific hormone feeds back to which specific gland. 

The ________ is the site of implantation of the fertilized egg.