(1) are lined with columnar epithelial cells (2) pass through the hypertonic medullary
interstitium (3) water leaves their lumen passively, without energy (4) take part in
countercurrent exchange
21. MALE REPRODUCTIVE SYSTEM
Directions
: each of the following statements contains five suggested completions. Choose
the one that is best in each case.
1. Spermatogenesis takes place in the following tubules:
A
– straight tubules; B – rete testis; C – seminiferous tubules; D – ductuli efferentes; E –
ductus deferens.
2. Each of the following statements concerning the spermatogenetic stage of
proliferation is true, EXCEPT:
A
– stem cells divide to give rise to two daughter cells: one remains as a stem cell, the
other is committed spermatogonium; B
– stem cells undergo meiotic divisions; C –
committed spermatogonia undergo several successive divisions to increase their number;
D
– the daughter cells of committed spermatogonium remain connected by cytoplasmic
bridges; E
– offspring of a stem cell is united to form the syncytium.
3. The following events take place at the spermatogenetic stage of growth:
A
– mitotic division of primary spermatocytes; B – meiotic division of secondary
spermatocytes; C
– mitotic division of spermatogonia; D – meiotic division of
spermatogonia; E
– prophase of the first meiotic division.
4. The following transformations of the spermatid take place in spermiogenesis
(stage of formation), EXCEPT:
A
– the nucleus becomes decondensed; B – Golgi complex produces an acrosomal
granule that is converted to an acrosome; C
– mitochondria form the helical sheath round
the axonemal complex; D
– the distal centriole initiates formation of the axonemal
complex, the proximal centriole remains near the nucleus; E
– residual cytoplasm is lost.
5. Each of the following statements concerning the testicular myoid cells is true,
EXCEPT:
A
– their cytoplasm is rich in myofilaments; B – are surrounded by the basal laminae; C –
their rhythmic contractions create peristaltic waves of the seminiferous tubules; D
– are not
capable of collagen synthesis; E
– are involved in selective transport into and out of the
seminiferous tubules.
6. Each of the following statements concerning the testicular Sertoli cells is true,
EXCEPT:
A
– their basal portions rest on the basal lamina; B – their apical portions have processes
extending into the tubule lumen; C
– possess centrioles and are capable of division; D –
their plasma membranes have receptors for FSH and testosterone; E
– their cytoplasm is
rich in organelles and inclusions.
7. Each of the following statements concerning the testicular Sertoli cell functions is
true, EXCEPT:
A
– support spermatogenic cells; B – provide the exchange of substances between
spermatogenic cells and blood; C
– eliminate residual bodies and abnormal sperms; D –
secrete testicular fluid, ABP, and inhibin; E
– provide peristaltic contractions of the
seminiferous tubules.
8. Each of the following statements concerning the compartmentalization of the
seminiferous tubules is true, EXCEPT:
A
– Sertoli-Sertoli tight junctions establish basal and luminal compartments; B –
spermatogonia are in the basal compartment; C
– spermatocytes and spermatids are in