A&P final

During which phase of the ovarian cycle is estrogen lowest?

early follicular phase

Ovaries are to a egg producers as _______ to sperm producers.

testes

What does LH stimulate in Sperm producing individuals

testosteron production

Calcium binds to _______ during the cross-bridge cycle.

troponin

Which about sarcomere shortening is TRUE?Select all that apply

A. The thick and thin filaments slide past each other. B. The length of the A band remains constant. D. The H zone almost disappears.

How do the skeletal muscle fibers in the legs of a marathon runner differ from those of an sprinter who runs the 100-meter dash?

A. longer and thinner muscle fibers B. mostly slow-oxidavtice fibers C. higher mitochondrial content D. less likely to fatigue

Which of the ovarian phases is matched with the correct hormone? Select all that apply. A. Follicular phase: progesterone B. Follicular phase: estrogen C. Luteal phase: progesterone D. Luteal phase: estrogen

B. Follicular phase: estrogen C. Luteal phase: progesterone

Which is true about innervation of skeletal muscle

Cell bodies of somatic motor neurons are within the CNS and axons extend out to skeletal muscle fibers. A motor unit is a single somatic motor neuron and all of the muscle fibers it innervates. Each motor unit contracts all at once.

Tension produced during contraction of a muscle is all or none (maximal force or no force).

False

Tension produced during contraction of a myofiber is all or none (maximal force or no force).

False

Testosterone is required for normal testicular development

False

What changes in length during muscle contraction? Choose all that apply.

I band Sarcomere H zone

During which of the following processes is ATP required?

Muscle cell contraction Muscle cell relaxation Resetting ion concentrations following action potentials

Developing spermatozoa are nourished by

Sertoli cells

During exercise, blood flow shifts from the G I tract to skeletal muscle as a result of increased oxygen demand. Which muscle type is mainly responsible for redirecting blood flow?

Smooth

Which allows action potentials to move rapidly from the cell surface into the interior of a muscle cell?

T-Tubules

What occurs during menstruation?

The endometriums loughs its surface layer.

Which of the following statements are TRUE? Select all that apply. The ovarian and uterine cycle can both be used to describe events in the menstrual cycle. The corpus luteum develops before ovulation. During oogenesis, both divisions in meiosis are completed before ovulation. During spermatogenesis, both divisions in meiosis are completed in about 9-10 weeks.

The ovarian and uterine cycle can both be used to describe events in the menstrual cycle. During spermatogenesis, both divisions in meiosis are completed in about 9-10 weeks.