/
External Structures of Dog Fish Shark External Structures of Dog Fish Shark

External Structures of Dog Fish Shark - PowerPoint Presentation

min-jolicoeur
min-jolicoeur . @min-jolicoeur
Follow
424 views
Uploaded On 2017-03-30

External Structures of Dog Fish Shark - PPT Presentation

Ms Hays Spring 2014 External Nares Nostrils Pair of openings on each side of the head cranial from the eyes Taken up into the smaller of the two openings and expelled through the larger openings ID: 531457

shark fin water fins fin shark fins water function dorsal pelvic amp head sharks location openings pectoral lateral eyes

Share:

Link:

Embed:

Download Presentation from below link

Download Presentation The PPT/PDF document "External Structures of Dog Fish Shark" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.


Presentation Transcript

Slide1

External Structures of Dog Fish Shark

Ms. Hays – Spring 2014Slide2

External Nares (Nostrils)

Pair of openings on each side of the head

cranial

from the eyes

Taken up into the smaller of the two openings and expelled through the larger openings

Water passes a sensory membrane allowing the shark to detect chemicals in water Slide3

Spiracles

Small openings

caudal

behind the eyes

Provides oxygenated blood directly to the eye and brain through a separate blood vesselSlide4

Spiracles

NostrilsSlide5

Mouth

Location: front of the head

Function: to eat; used for the intake of water that passes through the gillsSlide6

Gill Slits

5 vertical slits

Location: in front of the

pectoral

fin

Function: to take the oxygen from the water passing over the gills and discharge carbon dioxideSlide7

What is the function of the gill slits in this picture?

Gas Exchange! Slide8

Lateral Line

Location: extends noticeably from the pectoral fin past the pelvic fin.

Function: senses tiny pressure disturbances in the water

The lateral line is a line of pores that run along each side of the shark that help the shark orient to movement & sound. Slide9

Cloaca

Location: between the pelvic fins & claspers

Function: Opening for the sex organs as well as being used for excretory waste

Slide10

Clasper

Only present in males!

Location: down the middle of each pelvic fin

Function: Used to introduce the sperm into the cloaca of the femaleSlide11

What is the name of the structure that is on the side of the pelvic fins that is only present in males?

ClaspersSlide12

Fins

5 fins:

1

st

& 2

nd

Dorsal Fin – anti-roll stabilizing fins

Pectoral Fin – steering fins

Pelvic Fin – stabilizing fins

Caudal Fin – provides thrust Slide13

What are the names of the 5 fins of a shark?

1

st

Dorsal Fin2

nd

Dorsal Fin

Pectoral Fin

Pelvic Fin

Caudal FinSlide14

Rostrum

Pointed snout located at the front of the headSlide15

Dorsal Spines

Used defensively by the shark

Each has a poison gland associated with itSlide16

What is a characteristic of the lateral lines and what is a characteristic of dorsal spines?

Lateral Lines: senses tiny pressure disturbances in water

Dorsal Spines: used as a defensive mechanism, each has a poison gland associated with itSlide17

Denticles

Tooth-like scales on the surface of the sharks skin

Reduce drag and allow sharks to swim more silently & smoothly.Slide18

What is one characteristic of the dermal

denticles

on the surface of the sharks skin?

Tooth-like

Used to allow sharks to swim more silently & smoothlySlide19

Ampullae of

Lorenzini

Small vesicles and pores that form part of an extensive sensory network system.

Found on the head of the shark

Detect weak magnetic fields produced by other fishes

This enables the shark to locate prey that are buried in the sand or to orient to nearby movement

They may also allow sharks to detect changes in water temperatureSlide20

Where are the Ampullae of Lorenzini located on the shark?

HeadSlide21

Nictitating Membrane

A membrane that is present over the eyes that covers & protects the eyes during feeding.