Hydra cells get oxygen through diffusion.
The acid likely disrupted the hydra's osmoregulation process by changing the pH of the water, leading to an influx of water into the hydra's cells. This change in water balance triggered a contraction response in the hydra.
The lungs provide oxygen to cells by extracting oxygen from the air we breathe and delivering it to the blood. The blood then carries the oxygen to all cells in the body.
Blood delivers oxygen to the cells through the red blood cells. These cells carry oxygen from the lungs to the different tissues in the body where it is needed for cellular respiration.
Red blood cells, also known as erythrocytes, are responsible for carrying oxygen to cells throughout the body. They contain hemoglobin, a protein that binds to oxygen in the lungs and releases it to tissues in need of oxygen.
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Hydra cells obtain oxygen through diffusion. Gases, including oxygen, are exchanged directly with the surrounding water through the body wall of the hydra. This process allows oxygen to enter the cells and carbon dioxide to exit.
The stinging cells of the Hydra paralyze the daphnia.
The stinging cells in the hydra is what helps it paralyze its prey. Once it uses its stinging cells to paralyze it, the hydra then uses its tentacles to push into itsslef considering that its only one cell layer thin.
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Diffusion
A hydra is a carnivore. It primarily feeds on small aquatic prey, such as tiny fish, zooplankton, and other small invertebrates, which it captures using its specialized stinging cells called nematocysts. These cells help the hydra immobilize and digest its prey.
The tentacles of a hydra are the most sensitive because they are equipped with specialized cells called cnidocytes, which contain stinging structures called nematocysts. These cells allow the hydra to detect and capture prey, as well as sense changes in its environment. The high concentration of nerve cells in the tentacles enhances their sensitivity, enabling the hydra to respond quickly to stimuli. This adaptation is crucial for both feeding and defense.
Hydra will retract their tentacles into their body stem when touched. This is a response inherent in the plants from many centuries ago. Hydra do not like to be touched and close to protect themselves.
A hydra belongs to the biological domain Eukarya, which includes all organisms with cells containing a nucleus.