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ANSC 333
Exam 1 Key
| Question | Answer |
|---|---|
| Where does fertilization occur (BE SPECIFIC)? | Ampullary isthmic junction |
| What is the type of penis found in a bull? | fibroelastic |
| Are the ovarian structures housed in the cortex or medulla of the ovary in a cow? | cortex |
| What portion of the reproductive tract is supported by the mesosalpinx? | oviduct |
| What is the structure on the ovary that occurs before the corpus hemorrhagicum | follicle |
| Name all of the secondary sex glands found in the boar. | Prostate, bulbourethral glands, seminal vessicles |
| What two cells form the blood-testis barrier in the male? | Peritubular myoid and sertoli |
| Where are the sperm eligible for ejaculation stored (BE SPECIFIC)? | Cauda epididymis |
| As the testes descend into the scrotum, they invert the peritoneum into the body cavity creating two additional layers of tissue between the testis and scrotal skin. The layer closest to the scrotal skin is termed what? | Parietal vaginal tunic |
| What is the term used to describe the thickening in the muscularity of the vas deferens that can aid to increase the concentration of sperm in the ejaculate if the animal is allowed to perform false mounting? | ampulla |
| Completely classify the hormone LH based on its site of production, type of action, and chemical structure. | Anterior pituitary, reproduction, protein (or glycoprotein) |
| The hormone in this image increased in circulation due to an increase in pulse | amplitude |
| What type of secretion is defined as a substance being secreted from one cell and acting on a neighboring cell? | paracrine |
| The receptor for the hormone testosterone is located where in a cell? | nucleus |
| What is the function of the retractor penis muscles? | Maintain sigmoid flexure |
| Name one species whose cervical anatomy is made up of annular rings. | Cow, sheep, goat |
| Completely classify the hormone Estrogen based on its site of production, type of action, and chemical structure. | Gonad (ovary or testicle), reproduction, steroid |
| What second messenger is involved in LH hormone action? | cAMP |
| Name the cells of the testes that are located outside the seminiferous tubules in the interstitial space. These cells have receptors for what anterior pituitary hormone? | Leydig, LH |
| Identify where primordial germ cells originate from in the embryo. | Yolk sac |
| What part of the male external phenotype develops from the genital tubercle? | Glans penis |
| What is the name of the ligament that swells and shrinks pulling the testicles out of the body cavity into the scrotum? | gubernaculum |
| What is the name of the portion of the vagina that is common to both the urinary and reproductive systems? | vestibule |
| Briefly describe what a hormone antagonist is. | Binds receptor and blocks hormone action |
| What is the term used to describe the connective tissue layer on the outside of both the testicle and the ovary? | Tunica albuguinea |
| Identify one animal that has a bicornuate uterus. | Cow, pig, sheep, goat, mare |
| A follicle that has a single layer of cuboidal cells surrounding the oocyte is termed what? | primary |
| The corpus luteum has two cell types, the large luteal cells that originate from the _________________ cells of the follicle and the small luteal cells that originate from the ______. ____________ cells of the follicle. | _granulosa_,theca__ |
| Name three endocrine glands associated with reproduction. | Hypothalamus, pituitary, uterus, placenta, testicle, ovary |
| Identify and describe at least 4 key structures that males use to regulate temperature in the testes. | 1. scrotal skin: sweat glands and nerve endings: send message to brain to increase panting/respiration 2. cremaster muscle: short term testicle elevation and regulation of blood flow into testicle 3. Tunica Dartos: long term muscular contraction eleva |
| Describe why the anterior pituitary is referred to as “glandular tissue” and how it receives hormonal messages from the hypothalamus. Use names of specific hormones in your answer | GnRH is secreted from neurons into the hypohyseal portal system in the median eminence. GnRH then travels vial the blood to the anterior pituitary where it acts on receptors to secreate LH and FSH from A. pit. |
| Describe the two-cell, two-gonadotropin theory in FEMALES. Be sure to include the names of the cells and gonadotropins as well as how they interact to produce hormones. | Granulosa cells inside BM of follicle have receptors for FSH Theca cells outside BM of follicle have receptors for LH When LH binds receptor the Leydig cell produces testosterone that crosses the BM into the granulosa cell and is converted into estrogen |
| What is the term for the remaining antrum in the CL? | Lacuna |
| What is the name of the scientist that performed early experiments in rabbits to research how sex is determined? | Jost |
Created by:
megan_krzy