earthworm sea star dissection lab

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School

West Coast University *

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Course

1412

Subject

Anatomy

Date

Dec 6, 2023

Type

docx

Pages

5

Uploaded by ifeadeyemi11 on coursehero.com

Earth Worm & Sea Star Dissections: Objectives: ● Observe external and internal anatomy ● Locate and identify organs within the earthworm and sea stars ● Describe the appearance of various organs with the earthworm and sea stars ● Explain function of the organs with the earthworm and sea stars Introduction: The purpose of this lab is to discover the evolution of animal anatomy by comparing the internal anatomy of various animals in order of their evolution. Earthworms are the first animal to exhibit segmentation in their body. While sea stars are the first of 2 deuterostomes to be dissected in this unit. Part I Earthworm Dissection: Procedure - Watch the Earthworm dissection videos online and use the images/tables below to take notes during the videos. Label the external parts of the earthworm below. mouth segment Female genital pore Sperm groove clitellum Male genital pore prostomium
Label the internal parts of the earthworm below. Fill in the function of each of the earthworms organs in the table below. Organ Function Notes Aortic Arches Pumps blood throughout body Parallel columns, 5 Brain Conducts function of entire body Crop Stores food Highly vascularized, soft Esophagus Contains calciferous glands, releases calcium carbonate to rid excess calcium Follows pharynx Ganglia Sensory and motor nerve fibres Gizzard Grinds food completely Hard shell Intestine Contain cells that release fluids to aid in digestion Mouth Cavity Start of food digestion Nephridia Functions similar to kidney of vertebrates, Stringy Seminal receptacles Aortic arches nephridia Ventral nerve cord Ganglia Mouth Cavity Esophagus Seminal Vesicle Intestine Gizzard Crop Pharynx Brain
helps metabolic waste removal Pharynx Passageway of food Seminal Receptacles Receives sperm from other earthworms Seminal Vesicles Produces, stores and releases male sperm Ventral Nerve Cord Cord of nervous tissue Operates like spinal cord Part II Sea Star Dissection: Procedure - Watch the sea star dissection videos online and use the images/tables below to take notes during the videos. Label the internal parts of the sea star below. ce stomach anus Central disk Gonads gonads ampulla Madreporite Ring canal Radial canal Tube feet Cardiac stomach
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