VPHY 153 Endocrinology and Reproductive Physiology: Reproductive Behaviour
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Questions and Answers

What is the role of nitric oxide in the male sexual response?

  • Activates soluble adenylyl cyclase
  • Activates soluble guanylate cyclase (correct)
  • Results in increased production of cAMP
  • Causes vasoconstriction of blood vessels in the penis

What is the effect of cGMP on blood vessels in the penis?

  • Decreased blood flow
  • Vasodilation (correct)
  • Vasoconstriction
  • Increased blood viscosity

Which muscle is responsible for pushing semen from the base of the penis to the urethral opening during ejaculation?

  • Sphincter muscle
  • Ischiocavernosus
  • Bulbospongiosus (correct)
  • Seminal vesicle muscle

What is the primary role of testosterone in male sexual response?

<p>Increasing libido (C)</p> Signup and view all the answers

What is the function of Viagra in male sexual response?

<p>Inhibiting cGMP specific phosphodiesterase (D)</p> Signup and view all the answers

Which term refers to behaviors and signals in females that serve to attract males?

<p>Attractivity (D)</p> Signup and view all the answers

What are the three stages of male reproductive behavior?

<p>Precopulatory, Copulatory, Postcopulatory (D)</p> Signup and view all the answers

When does sexual receptivity occur in females?

<p>Only during estrus (D)</p> Signup and view all the answers

What is the male behavior that involves penile erection and protrusion?

<p>Mounting (D)</p> Signup and view all the answers

What is required for successful reproductive behavior?

<p>Mature ovum and proper organ function (D)</p> Signup and view all the answers

Which system is activated by erotic thoughts or physical stimulation in males?

<p>Parasympathetic system (A)</p> Signup and view all the answers

What initiates increased production of nitric oxide in males during sexual response?

<p>Erotic thoughts or physical stimulation (A)</p> Signup and view all the answers

What is the main difference between the copulatory patterns of a bull, billy goat, and ram compared to other species mentioned?

<p>They have a fibroelastic penis and small volume of semen. (C)</p> Signup and view all the answers

Which species has the ability to copulate 3 to 4 times in a day but easily gets satiated?

<p>Boar (C)</p> Signup and view all the answers

What is unique about the copulatory patterns of a mating pair compared to other species?

<p>They have a prolonged copulation duration. (A)</p> Signup and view all the answers

In terms of volume of ejaculate, which species has a range of 0.8-1mL?

<p>Boar (A)</p> Signup and view all the answers

Which species has a fibroelastic penis with a vascular structure and accordingly engages in prolonged copulation?

<p>Bull (D)</p> Signup and view all the answers

What is characteristic of the external cervical Os in terms of number of ejaculations to satiation?

<p>It takes 30-40 ejaculations to reach satiation. (B)</p> Signup and view all the answers

What is the purpose of releasing acrosomal enzymes during the acrosomal reaction?

<p>To create pores in the zona pellucida (C)</p> Signup and view all the answers

What happens when the plasma membrane overlying the acrosomal membrane fuses with the outer acrosomal membrane?

<p>Vesiculation to create pores (D)</p> Signup and view all the answers

What is required for fertilization to occur?

<p>Fusion of equatorial segment and oocyte plasma membrane (D)</p> Signup and view all the answers

What is the role of fusion proteins during sperm-oocyte fusion?

<p>Facilitating fusion between equatorial segment and oocyte plasma membrane (B)</p> Signup and view all the answers

After completely penetrating the zona, where do sperm reach before fusion with the oocyte plasma membrane?

<p>Perivitelline space (C)</p> Signup and view all the answers

What happens to vesicles after the acrosomal reaction is complete?

<p>Sloughed off (A)</p> Signup and view all the answers

What is the purpose of cornual insemination in cows?

<p>Minimize cervical deposition (C)</p> Signup and view all the answers

In the artificial insemination technique in mares, what is used to gauge the depth of insemination?

<p>Marker (C)</p> Signup and view all the answers

In sow artificial insemination, why is a high volume of radiopaque contrast medium necessary?

<p>To mimic the inseminant distribution in uterine horns (A)</p> Signup and view all the answers

What is the role of the index finger in mare artificial insemination?

<p>Guide the insemination pipette into the cervical lumen (B)</p> Signup and view all the answers

What is the design purpose of the spiral tip in the artificial insemination pipette for sows?

<p>Penetrate the interdigitating prominences of the cervix (D)</p> Signup and view all the answers

What is the volume of inseminate deposited in both uterine horns during cornual insemination?

<p>0.5-mL in each horn (D)</p> Signup and view all the answers

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