Page 214 - Biology_F5

Comparative studies of natural groups of organisms

its contents using the mucus secreted from produces sperms in male and eggs in female.
its internal thick wall of mucous membrane. The kidneys are bean shaped structures
Rectum connects the colon to the anus, found on the back of the abdominal cavity
which aids in temporary storage of feaces on either side of the spine and are embedded
before its release (when the sphincter in the fats. On top of each kidney are small
contracts), and aids their release through glands called adrenal glands (Figure 3.74).
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the anus (when the sphincter relaxes). In addition, a small and delicate tube called
ureter is attached to each kidney, which
Urinogenital system of a male mouse leads the urine to the urinary bladder. The
The urinary and reproductive systems are urinary bladder is connected to the urethra,
integrated in some ways and are usually which carries urine from the bladder to the
studied together as urinogenital system. urethral orifice then to the outside through
However, the excretory system eliminates the penis.
waste product and the reproductive system

Adrenal gland

Kidney
Fat
Ureter
Spermatic cord
Lumber lymph node Vesicular seminalis
Coagulating gland
Bladder

Cut

Figure 3.74: The urinogenital system of a male mouse

Males have two openings on the pelvic area; genital opening and the anus. The genital
opening passes both urine and sperms via a penis hanging out from or between the two
scrotal sacs. The scrotal sacs protect the testes (singular testis). The testes (which secrete
sperms) are connected to a coiled tube called epididymis which collects the produced
sperms and store them. The epididymis is very long twice the length of the testis. It has

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