What is ecto and endoplasm?
Endoplasm generally refers to the inner (often granulated), dense part of a cell’s cytoplasm. This is opposed to the ectoplasm which is the outer (non-granulated) layer of the cytoplasm, which is typically watery and immediately adjacent to the plasma membrane.
What is the function of the endoplasm in amoeba?
Endoplasm is the inner layer of the cytoplasm in amoeba. It is denser and contains many granules. Also, it is responsible for regulating the concentration of water inside the cell, which in turn determine the location of pseudopodia.
Why are the hagfish and the lamprey placed in such distant taxa?
Agnathans: Jawless Fishes Hagfishes and lampreys are recognized as separate clades, primarily because lampreys are true vertebrates, whereas hagfishes are not. A defining feature of agnathans is the lack of paired lateral appendages or fins.
Are lampreys Gnathostomata?
Hagfish and lampreys are the only living representatives of the jawless vertebrates (agnathans), and compared with jawed vertebrates (gnathostomes), they provide insight into the embryology, genomics, and body plan of the ancestral vertebrate.
What is the difference between the endoplasm and cytoplasm?
Endoplasm is the inner granulated, dense part of a cell’s cytoplasm and ectoplasm is the outer non-granulated layer of the cytoplasm. Cytoplasm-It is a jelly like semi fluid general mass of protoplasm excluding the nucleus but including all other components-cytoplasmic matrix,cell organelles,and cell inclusions.
What is the difference between endoplasm and cytoplasm?
How does the amoeba feed?
Amoebas obtain food by capturing their prey with their pseudopodia. The food is internalized through a type of endocytosis known as phagocytosis. In this process, the pseudopodia surround and engulf a bacterium or other food source. A food vacuole forms around the food particle as it is internalized by the amoeba.
How do hagfish feed?
Their feeding habits are disgusting but important. Although they have been observed actively hunting fish, hagfish mostly feed on dead and dying creatures on the sea floor. They are known to bury themselves face-first in a carcass, boring a tunnel deep into its flesh to eat their meal from the inside out.
How do lampreys feed?
Lamprey larvae feed on microscopic life and organic particles that are filtered from the water by the gills. Adults in the parasitic stage attach themselves to other fish and suck blood through a hole rasped in the host fish by a hard, tongue-like structure in the middle of the mouth disc.
Does lamprey have vertebral column?
There are two living groups of jawless fish, with about 100 species in total: lampreys and hagfish (Figure below). Although hagfish belong to the subphylum Vertebrata, they do not technically have vertebrae (though they do have a skull), whereas lampreys do have vertebrae.
What do lampreys feed on?
Lampreys feed upon fish with their suckers and breathe in and out of their branchial gill sacs. Parasitic species of lampreys can be flesh-feeders or blood-feeders, depending primarily on the structure of their teeth.
What is the difference between lampreys and ammocoetes?
In both lampreys and ammocoetes the branchial basket is actively compressed for exhalation; branchial expansion and inhalation is by passive elastic recoil, but in ammocoetes water is drawn from the mouth.
What is the function of the velar pump in lampreys?
Ammocoete larvae use a velar pump for unidirectional ventilation and suspension feeding. In both lampreys and ammocoetes the branchial basket is actively compressed for exhalation; branchial expansion and inhalation is by passive elastic recoil, but in ammocoetes water is drawn from the mouth.
Why do lampreys have trigeminal pattern generators?
Trigeminal pattern generators in lampreys may be a holdover from the ammocoete stage, in which they drive nearby velar motoneurons as the primary pump for ventilation. Respiration in lampreys and ammocoetes is stimulated by hypoxia and modulated by reflexes.