Fossils from Australopithecus provide evidence for evolution:
It was a developing form between apes and humans.
Possessing the duplicated SRGAP2 which raised the length and ability of neurons in the brain, they were the first hominids to carry this certain genes.
The bones of your arms are called humerus, while your forearms are composed of two bones, the radius and ulna. The bones of your fingers are called metacarpals and each one of those small bones are called phalanges.
The bones of your shoulders are composed of the clavicle, the bony part seen just right under the neck. Part of the shoulder area is the scapula, which is located at the back part of the body attached to the upper part of the ribs. They are the triangle-shaped bones you feel when you cross your arms at the back.
The bones of your thighs are called femur, they are the largest bones in your body. While the bones of your legs are called tibia and fibula. The bones of your toes are called tarsals and each are composed of smaller bones called metatarsals. Your heels also have bones and they are called calcaneus.
The bones of your pelvis are called Coxal bones as a whole but they are composed of the illium (biggest part of your hips); the pubic bone, located along the reproductive organ; the sacrum and coccyx all located at the base of the spine.
Ribosomes - An organelle that creates proteins.
Golgi Apparatus - Moves lipids around the cells, also modify's, sorts, and packages proteins.
Hope this helps!
Muscles are required in breathing, talking, running, walking, and any body movement. Actin and myosins are protein filaments present in muscle cells that help to contract and relax or change the shape of muscles. Muscles are responsible for the movement or motion of organisms. Joints are the connection between two or more bones. Most joints are mobile.
Muscle strength is determined by several factors. Some of those are the physical shape, size, and innervation of the muscles.
Weak contraction
- Potassium accumulates in the sarcoplasm.
- Contracted lower sarcoplasm pH.
- Begin contraction with muscle already 50%.
- The circular arrangement of muscle fascicles.
Stronger contraction
- Increase in muscle belly circumference.
- A lesser proportion of motor neurons to muscle fibers.
- Increased recruitment.
- Increased stimulus frequency.
Photosynthetis, burning of fossil fuels, plant respiration.
