MARINE BIOLOGY
11th Edition
ISBN: 9781259880032
Author: CASTRO
Publisher: RENT MCG
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Textbook Question
Chapter 8, Problem 1CT
Hagfishes and lampreys are the only living representatives of a very ancient group. Why do you suppose there are still some of these jawless fishes around?
Expert Solution & Answer
Summary Introduction
To explain: The reason why there are still some of hagfishes and lampreys around.
Introduction: Jawless fishes are the most primitive fishes living today. They have cylindrical and elongated body like that of snakes or eels. Hagfishes and lampreys are jawless fishes. Hagfishes live in burrows, whereas lampreys are mostly found in temperate regions.
Explanation of Solution
There are still some of hagfishes and lampreys around due to the following reasons:
- Both hagfishes and lampreys are highly adopted species of the class Agnatha.
- Since both hagfishes and lampreys are living fossils, they are the most successful ones.
Some jawless fishes still survive as highly specialized forms, such as unusual predators and parasites. These specialized structures have not been outcompeted by other advanced fishes.
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Digoxin: Intravenous Bolus - Two Compartment Model
Drug
Digoxin
Route:
IV Bolus
Dose:
0.750 mg
Plasma Concentration Time Profile
Beta
Alpha
Time (hrs)
Conc (ng/ml)
LN
(ng/ml)
LN
(ng/ml)
LN
0.00
#NUM!
#NUM!
#NUM!
0.10
12.290
2.509
#NUM!
#NUMI
0.60
6.975
1.942
#NUM!
#NUMI
1.00
4.649
1.537
#NUM!
#NUMI
2.00
2.201
0.789
#NUM!
#NUM!
3.00
1.536
0.429
#NUM!
#NUM!
4.00
1.342
0.294
#NUM!
#NUM!
5.00
1.273
0.241
#NUM!
#NUMI
6.00
1.238
0.213
#NUM!
#NUM!
7.00
1.212
0.192
#NUM!
#NUM!
8.00
1.188
0.172
#NUMI
#NUM!
9.00
1.165
0.153
#NUM!
#NUMI
10.00
1.143
0.134
#NUMI
#NUM!
11.00
1.122
0.115
#NUM!
12.00
1.101
0.096
#NUMI
13.00
1.080
0.077
#NUMI
16.00
1.020
0.020
#NUMI
24.00
0.876
-0.132
#NUMI
Pharmacokinetic Parameters
Parameter
Value
Alpha
B
Beta
Units
ng/ml
hr-1
ng/ml
hr-1
CO
ng/ml
H.C
AUC
ng x hr/ml
Vc
Vbeta
Vss
C
L/hr
TK (alpha)
hr
TX (beta)
days
5+
F3
F4
F5
0+
F6
F7
%
6
95
14
#3
29
&
t
F8
F9
FW
EW
Chapter 8 Solutions
MARINE BIOLOGY
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