Unit 07 - Short Questions Flashcards
Give an example for a substance which acts both as a neurotransmitter and hormone?
Nor-epinephrine (nor-adrenaline) is released as a neurotransmitter by sympathetic nerve endings and also is secreted by the adrenal gland as a hormone.
How do unicellular organisms capture signals?
They have cell receptors and effectors.
What is the only major phylum of multicellular animals that lack network of nerve cells?
Sponges
The simplest nerve net are found in?
Coelenterates
How much does a human brain weigh?
1.2kg (2% of body weight)
What are the 2 systems contributing to coordination in animals?
- Endocrine system
2. Nervous system
List the 3 main distinct regions the brain is differentiated into.
- Forebrain
- Mid brain
- Hind brain
What are the 3 main parts of the forebrain?
- Cerebrum
- Thalamus
- Hypothalamus
The two hemispheres of the cerebrum are joined together by?
Corpus callosum
The four lobes of the cerebrum are,
- Frontal lobe
- Parietal lobe
- Temporal lobe
- Occipital lobe
What are the 3 main sulci that marks the boundary of lobes?
- Central sulcus
- Lateral sulcus
- Occipital sulcus
What are the two distinct regions that can be observed in a cross section of the cerebrum?
Cerebral cortex and white matter.
What is the use of gyri?
These convolutions increase the surface of grey matter in the brain.
What is the location of the central sulcus in cerebrum?
Runs downward and forward from the midline of each cerebrum. This separates frontal lobe from parietal lobe.
What is the location of the lateral sulcus in cerebrum?
Runs backward and slightly upwards of side walls of each cerebrum. This separates frontal and parietal lobe from temporal lobe.
