30 Questions
What is the main function of Sertoli cells in the seminiferous tubules?
To provide nutrients and regulate spermatogenesis
What is the typical ratio of Sertoli cells to germ cells in the human testis?
1 to 11
Which cell type is responsible for the contraction of the seminiferous tubules to move fluid and sperm?
Peritubular myoid cells
What is the approximate duration of the complete spermatogenesis process in humans?
64 days
What is the role of retinoic acid (RA) in spermatogenesis?
RA drives the differentiation of spermatogonia and their entry into meiosis
What is the main function of the spermatogonial stem cell (SSC) niche in the seminiferous tubules?
To support and maintain the pool of spermatogonial stem cells
What is the main mechanism by which Sildenafil (Viagra) causes erection?
Inhibition of phosphodiesterase type 5, leading to increased cGMP and smooth muscle relaxation
What is the main cause of priapism in sickle cell disease (SCD) patients?
Occlusion of microcapillaries in the corpus cavernosum
What is the main function of the acrosome reaction in the fertilization process?
To allow the sperm to penetrate the zona pellucida of the oocyte
What is the maximum time period during which an oocyte can be fertilized after ovulation?
24 hours
Which of the following is not a characteristic of the capacitation process in sperm?
Increased production of nitric oxide
What is the maximum time period during which ejaculated sperm can remain viable in the female reproductive tract?
6 days
What is the primary function of the scrotum in the male reproductive system?
To maintain a lower temperature for the testes
Which muscle is responsible for increasing the wrinkles of the scrotum to help cool the testes?
Dartos muscle
What is the role of the pelvic floor muscles in the male reproductive system?
They support the organs in the abdomen
Which of the following is NOT a function of the bulbospongiosus muscle in the male reproductive system?
Controlling ejaculation
What is the primary role of the epididymis in the male reproductive system?
Storing sperm
What is the primary function of the corpora cavernosa and corpora spongiosum in the penis?
Facilitating the flow of blood during erection
What is the main function of the vas deferens in the male reproductive system?
Store and transport sperm to the urethra
Which cell type in the testis is responsible for the production of testosterone in response to luteinizing hormone (LH)?
Leydig cells
What is the term for a condition where there are less than 20 million sperm per milliliter in the ejaculate?
Oligospermia
Which gland is responsible for producing approximately 25% of the seminal fluid that nourishes and protects sperm?
Prostate
What is the primary role of Leydig cells in the testis?
Produce testosterone
Which enzyme converts testosterone (T) to dihydrotestosterone (DHT) in the testis?
6 reductase
What is the main purpose of testosterone and FSH in the context of spermatogenesis?
To optimize various steps like survival, meiosis, and spermiogenesis
Where does most of the serum testosterone bind to in the body?
Sex hormone binding globulin (SHBG)
What is the classical mechanism of action for testosterone and DHT within cells?
Binding to androgen receptor, dimerization, and nucleus translocation for gene transcription
Which cells does testosterone primarily regulate in the testis?
Mature Sertoli cells
Besides reproduction, what other function do androgens play a role in?
Cardioprotective effects
What is the main significance of intratesticular testosterone compared to serum testosterone?
It is mostly free in its unbound form
This quiz provides a summary of the male reproductive system anatomy focusing on the external and internal genitalia, including the functions of the scrotum and the muscles that control it. Topics covered include the roles of testes, epididymis, vas deferens, and sphincters to prevent mixing of urine and semen.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
