Table of Contents
- 1 What are the role of hooks in platyhelminthes?
- 2 What are the advantages for Turbellarians to have a flattened body shape?
- 3 What is the function of hooks?
- 4 What is the main function of sucker?
- 5 What are the main characteristics of flatworm?
- 6 Why platyhelminthes are called flatworms?
- 7 What does the longitudinal arch of the hand do?
- 8 Is the proximal transverse arch rigid or flexible?
What are the role of hooks in platyhelminthes?
Hooks are short, curved, hardened structures that protrude from the surface of a parasite. They are usually numerous and aid attachment by penetrating host tissues. Their curvature provides tremendous anchoring power. They are often under muscular control.
What are the advantages for Turbellarians to have a flattened body shape?
Flat Shape The shape of a flatworm allows the species to survive without a circulation system. The purpose of circulation is to deliver oxygen and remove waste from cells throughout the body — specifically the cells furthest from the surface.
What are the advantages of stereo senses?
What is one advantage of having stereo senses? It allows the hunter to sense exactly where its prey is with triangulation. Where is the flatworm’s mouth located? It is on the underside of the body.
What body system is often the most advanced body system in parasitic worms?
The reproductive system is often the most advanced body system. Proglottids contain the reproductive structures. They break off and are eliminated with the feces. The size of the parasite is limited by the size of the host.
What is the function of hooks?
Hooks are a category of function that allows base code to call extension code. This can be useful in situations in which a core developer wants to offer extensibility without exposing their code. One usage of hooks is in video game mod development.
What is the main function of sucker?
A sucker in zoology refers to specialised attachment organ of an animal. It acts as an adhesion device in parasitic worms, several flatworms, cephalopods, certain fishes, amphibians, and bats. It is a muscular structure for suction on a host or substrate.
Is a flatworm a parasite?
Flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it.
What diseases can flatworms cause in humans?
Paragonimiasis is caused by infection with a flatworm. That’s a parasitic worm also called a fluke or lung fluke because it commonly infects the lungs. Usually, infection comes after eating undercooked crab or crayfish that carry immature flukes. Once swallowed by a person, the worms mature and grow inside the body.
What are the main characteristics of flatworm?
The main characteristics of flatworms (Figure below) include:
- Flatworms have no true body cavity, but they do have bilateral symmetry.
- Flatworms have an incomplete digestive system.
- Flatworms do not have a respiratory system.
- There are no blood vessels in the flatworms.
Why platyhelminthes are called flatworms?
The animals of phylum Platyhelminthes have their bodies dorsoventrally flattened. Because they appear flat, they are called flatworms.
How can you avoid the infection of tapeworm?
To prevent tapeworm infection:
- Wash your hands with soap and water before eating or handling food and after using the toilet.
- When traveling in areas where tapeworm is more common, wash and cook all fruits and vegetables with safe water before eating.
What are the 5 types of hooks?
5 common types of essay hooks
- 1 Statistic hook.
- 2 Quotation hook.
- 3 Anecdotal hook.
- 4 Question hook.
- 5 Statement hook.
What does the longitudinal arch of the hand do?
LONGITUDINAL ARCH Observe this arch’s behavior as you loosely close your fist. Tighten the fist and watch the fourth and fifth metacarpals. The arches provide a balance between stability and mobility for grasping.
Is the proximal transverse arch rigid or flexible?
The proximal transverse arch is rigid, but the other two arches are flexible, and are maintained by activity in the hand’s intrinsic muscles. PROXIMAL TRANSVERSE ARCH Hertling and Kessler(p. 257) describe this arch as a composite of two arches, the proximal and distal carpal arches.)
How does the adductor pollicis stabilize the hand?
(The adductor pollicis stabilizes an object against the palm; the hand’s position is static.) cylindrical grip (fist grasp is a small diameter cylindrical grasp) spherical grip hook grip (MP extended with flattening of transverse arch; the person may or may include the thumb in this grasp)