Chapter 3 (Male Reproductive Tract) Flashcards
What are the 3 functions of the male reproductive tract
- produce sperm
- produce hormones (testosterone)
- delivery of gamete (ejaculation)
Testicles try to stay (temp) cooler than the body
3-6 degrees Celsius
Cryptorchidism
when the testicles stay in the body cavity which results in sperm being fertile
Sperm are finished in the ___
epididymis
Cremaster muscle
a striated muscle (short term contraction)
for fight or flight situation, brings testicles close for short periods
Testicular artery
brings blood to the testicles
Ductus deferens
takes sperm from the epididymis into the accessories (for ejaculation)
Parietal vaginal tunic
two smooth muscles attached to one another that leads to less friction and free moving testicles within the scrotum
Dartos muscle
smooth muscle (longterm contractions) brings testicles close to the body for long periods of time (temperature control)
What are the bundle of veins in the testicles called
Pampiniform plexus
What is the muscle used to bring the testicles close during fight or flight situations
Cremaster muscle
What is the muscle used to bring the testicles close during cold temperatures
Dartos muscle
What does the retractor penis muscle do in cows
it contracts the penis into a sigmoid fixture (S) shape
Which two species has a vascularized penis
Stallion and dog
What is unique about a boars ejaculation
since they produce a great amount of ejaculate, they produce a think gel fraction to serve as a plug to keep it all in
4 ways to keep the testicles cool
- heat dissipation through artery surface area
- lowered blood pressure in testicles
- scrotum skin
- dartos muscle
The dissipation of heat from the blood in the testicles is dependent upon ___
surface area (more surface area = more heat dissipated)
The skin of the scrotum contains ___ which are sensitive to temperature changes
thermo sensitive neurons
(T/F) Breathing helps cool down the body
True
The skin of the scrotum also has many ___ to help keep the testicles cool
sweat glands
