"Hemichordate" Natural Recordings by Native Speakers
Hemichordate refers to a group of marine animals that belong to the phylum Hemichordata. They are characterized by their three-part body (stomochord, dorsal hollow nerve cord, and pharyngeal gill slits), which is similar to that of chordates, including animals such as humans. Hemichordates are found mostly in marine environments and are often small, ranging from a few millimeters to tens of centimeters in length. Despite their similarities to chordates, hemichordates do not have a true horse-shoe shaped notochord, and are considered to be evolutionary relatives of chordates, but not chordates themselves.
Hemiblock is an irregular heart rhythm characterized by a blockage of electrical signals in the heart, typically occurring in the right bundle branch. It impairs the heart's ability to pump blood efficiently, often causing symptoms such as rapid or irregular heartbeat, shortness of breath, fatigue, and dizziness.
Hemicardia refers to a type of abnormal cardiac rhythm, specifically a type of atrial tachycardia that originates from the atrial muscle itself, rather than from the atrioventricular (AV) node. It is usually characterized by a rapid heart rate, often above 140 beats per minute, and can be associated with symptoms such as palpitations, shortness of breath, and lightheadedness. Hemicardia can be treated with medications, cardioversion, or other procedures depending on its underlying cause and severity.
Hemicellulose is a type of complex carbohydrate found in the cell walls of plants. It is a straight-chain polysaccharide made up of five-carbon sugars, such as arabinose, xylose, and glucose, that are linked together through beta-1,4 glycosidic bonds. Hemicellulose is broken down into smaller sugars by enzymes during the digestion process in the rumen of ruminant animals, such as cows and sheep, and is an important source of energy for these animals. It is also used in the production of biofuels, paper, and other products.
The hemicerebrum refers to the left or right half of the cerebrum, which is the largest part of the brain responsible for processing sensory information, controlling movement, and managing higher-level cognitive functions such as thought, emotion, and memory.
Hemicholinium is a type of compound that was previously used as a muscle relaxant in the treatment of tetanus and other muscle spasms. It is a natural product obtained from the bark of the Guaiacum officinale tree.
Hemicolectomy is a surgical procedure where a doctor removes one half (hemi) of the colon (colectomy). It is typically performed to remove a tumor, diverticulum, or other abnormal growth that has formed in the upper or lower part of the colon.
Hemicrania is a rare type of headache disorder characterized by severe, debilitating headaches that occur on one side of the head. The headaches are usually accompanied by tearing and redness of the eye and may be triggered by emotional or stress-related factors. There is no known cause for hemicrania, but it is often treated with medication and lifestyle changes.