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THE DIGESTIVE SYSTEM OF VERTEBRATES

MAMMALS: Rat  (mole rat, rat kangaroo listed separately)

Norway rat (photo by E J Taylor)    < go to CD



Norway rat (Rattus norvegicus) digestive tract (Stevens & Hume 1995)



Figure 2.1.  Relationship between mass-specific metabolic rate (ml O₂/g^.h) or metabolic intensity and log of body mass for eutherian mammals ranging from 6 g shrews to 1,300-kg elephants. Note the inverse relationship between mass-specific metabolic rate and body mass. (From Schmidt-Nielsen 1984).  (CD Figure 3.1)



Figure 4.8. Rat stomach showing the region of stratified squamous epithelium.  (Modified from Stevens and Hume 1995)  (CD Figure 5.8)


Table 7.3.  (CD Table 8.3)



Table 7.5b.  (CD Table 8.6b)

Enzymatic activity is designated as + (present), trace or 0 (absent). Results in brackets indicate use of and alternate substrate. All data from adult specimens. (from Vonk and Western 1984 plus perissodactyla data from Roberts 1975)


Table 7.8.  (CD Table 8.11)

0, no absorption or transfer; + to +++, degrees of absorption or transfer. (from Brambell 1970)


Table 8.7a.  (CD Table 9.7a)

* Absorption from cecum (or ceca) alone.
Dashes indicate absence of information. Contributions of SCFA to maintenance energy were estimated from the rate of SCFA production by in vitro isotope dilution or measurements of digesta flow. Total maintenance energy was either calculated as twice the BMR or assumed to be equivalent to ad libitum digestible energy intake in captive, nonreproducing, and adult animals. (From Stevens and Hume 1995.)



Figure 9.6.  Organization of the submaxillary gland of the rat (from Leeson 1967)  (CD Figure 10.6)



Figure 9.8. Electrolyte transport across the acinar cells of the parotid salivary glands of humans, dogs, cats, and rats. (Modified from Cook, Van Lennep, Roberts, and Young 1994.)  (CD Figure 10.8)