If a molecule is too big or has a charge it will not diffuse through the membrane by passive transport.
Jellyfish do not have a central nervous system.
Squids which belongs to Cephalopoda (class of Mollusca) have the most complex nervous system of the invertebrates. They have well-developed senses and large brains. So, they are considered as the most intelligent of the invertebrates.
Dolphins, on the other hand, are regarded as one the most intelligent animal.
The lateral rectus and the medial rectus muscles are responsible for Adduction and Abduction of the eye
The muscles of the eye help to move and stabilize both eyes. Six extraocular muscles control all of the movement of the eye which are
- Superior rectus,
- Inferior rectus,
- lateral rectus,
- medial rectus,
- superior oblique,
- inferior oblique.
Adduction is the movement of the eye towards the nose with the medial rectus muscle responsible for it while Abduction is the movement of the eye away from the nose with the lateral rectus responsible for it .
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