Abdominal aortic aneurysms that measure over _____ are at the greatest risk for rupture

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.

Fill in the following:     Stimulus: _______ (Remember to say if the stimulus is increased or decreased)     Endocrine gland activated: _______      Hormone released: _______     Target organ(s) affected: _______     Response:  Increased reabsorption of sodium 

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

The sarcomere represents the minimal amount of structure necessary to carry out muscle contraction and is referred to as the _______ of skeletal muscle.

Which chemical causes an inhibition of the release of ACh?    a. Curare    b. Black widow spider toxin    c. Botulinum toxin    d. Nerve gas    e. Some pesticides

All of the following can be used to describe the length-tension relationship for skeletal muscle except:    a. It exhibits an optimal muscle length for tension generation.    b. It can be explained using the sliding filament mechanism.    c. At lengths less than optimal the tension generated is reduced.    d. At lengths greater than optimal the tension generated is greatest.    e. All of those mentioned are true.

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

Using the letters corresponding to the stages in the physiology of muscle contraction, write the events of muscle contraction in chronological order in the space provided. Note:  The first step begins somewhere in the neuron as I want to determine if you still understand some of the steps that take place in the neuron from previous notes.     a. Attachment of another ATP allows the cross bridge to detach from the actin and repeat the cycle over  again as long as Ca2+ remains attached to troponin.    b. Voltage-gated Ca2+ channels open in pre-synaptic terminal and Ca2+ enters cell.    c. Ca2+ attaches to troponin, causing a conformational change in its structure.     d. Action potentials in the T tubule stimulate the release of Ca2+ from the terminal cisternae.    e. ACh diffuses across cleft and binds to ACh receptors.     f. Action potentials stop being produced, SR accumulates calcium and the troponin-tropomyosin complex moves again to its inhibitory position.    g. Binding of ACh to receptors opens up ion channels on muscle cell membrane that causes EPP’s and a      depolarization of the muscle.    h. Myosin cross-bridges bind ATP, attach to actin, and undergo a power stroke.      i. Action potentials are conducted in a motor neuron and arrive at the terminal of the axon.     j. Shape change in troponin causes tropomyosin to shift position in the actin filament, thus exposing binding sites for the myosin cross-bridges.    k. T tubules conduct action potentials deep into the muscle fiber.    l. Ca2+ entry causes the release of ACh at the neuromuscular junction.  m. Action potentials are conducted across the muscle cell membrane.

_______ is a hormone produced by sunlight striking the skin.  Spell out hormone completely.