5. Whales or lodans (specifically those with teeth and not
small ones) are a group of mammals that live in the ocean.
The title “whale” is given to a member of the large
Cetacean nation. Whales do not belong to the fish family.
Whales have the following characteristics:
• Breathe using lungs
• have hair (slightly, mostly in adult whales)
• Hot blooded
• Have mammary glands
• Has a heart with four chambers
Meaning of
whale
6. Kingdom : animalia
Fillum : Chordata
Kelas : mammalia
Ordo : Cetacea
Famili : Balaenopteridae
Genus : Balaenoptera, Megaptera
Spesies : Balaenoptera Sp.
Blue Whale : Balaenoptera musculus
Humpback whale : Megaptera novaeangliae
Sei whale : Balaenoptera borealis
Whales
Classificati
on
7. Whales can be found in all of the world's major
oceans, from the polar regions to the tropical
oceans. Whales cannot be found in icy waters
such as the North Pole and South Pole. Whales
also cannot be found in small waters far from the
open ocean. The largest population of these
whales is found in warm and cold waters. Whales
feed on plankton, fish, squid and crustaceans,
including mysidacea and krill.
Whale
habitation
8. Mammals that live in water all their lives and have made various adaptations for life in this
environment. The whale has a long oval body that shows a plane in comparison to the whale's
body. The head is flat and U-shaped and has a prominent back that extends from the blowhole
to the upper lip. The front of the mouth is thick with baleen plates; about 300 plates (each
plate about one meter long) hang from the upper jaw, reaching 0.5 m which return into the
mouth. Between 60 and 90 indentations (called the ventral plate) extend from the esophagus
parallel to the body. These plates help in moving water from the mouth after a feeding motion.
The dorsal fin is small, which is seen briefly during the dive sequence. Located about three-
quarters of the length of the body that distinguishes one individual from another; some have
only a few clear clumps, but others may have prominent and falcate dorsals.
Whale
Marphology
9.
10. Respiration
Whales have a distinctive circulatory system that allows blood to
flow directly from the organs to the brain. In this way, until the
whale emerges on the surface of the water to breathe, it can still
send oxygen in its body directly to the brain, the organ that needs
oxygen the most. In this way the whale can remain under the sea for
approximately 15-20 minutes without breathing.
Digestive system
Digestion of food can occur mechanically and chemically.
Mechanical digestion is a process that converts food into small
parts. Chemical digestion is a process of changing food with the
help of digestive enzymes.
Whale
anatomy
11. Nervous system
The nervous system in mammals, in general, has a higher level of
development than other classes. The cerebrum is larger than the rest
of the brain. The cerebellum is also larger and has 2 lateral lobes.
There are 4 optic lobes, each laterally divided by a transverse groove
into anterior and posterior lobes. The brain (encephalon) consists of
several parts that are almost the same as other vertebrates, such as
the prosencephalon, optic lobe cerebellum and medulla oblongata.
Additional/
advanced
12. All types of mammals give birth by means of internal fertilization (internal
fertilization). In addition, all types of mammals have separate genitals and
sexsual characteristics that only each sex has. Mammals also have a very
complex structure and function of the reproductive system, in contrast to birds
and reptiles.
In the class mamaia, the male reproductive system has a pair of testes, a
pair of testes, a pair of reproductive glands, a vascular system and genitals
(penis). Whereas in females, it consists of a pair of parent eggs where to produce
eggs and various hormones, a pair of Fallopian tubes (oviducts) which serve as a
channel from the first egg to the largest or called uteri (where the embryo
develops), the vaginal gate from the outside of the body, and the cervix, which
connects the uterus and vagina.
Whale
reproduction
