SAAT Biology Section 5 Questions(1) (Human Biology) - تحصيلي

How many bones does an adult human have?

206

Haversian systems exist in

Dense bone

It produces red, white blood cells, and platelets

Red marrow

When a bone fracture occurs, which of these cells work first?

Osteoclast cells

They are chemicals released by the brain when an injury occurs that relieve pain

Endorphins

The joint shown in the picture is

An elbow

Actin and myosin filaments can be seen in the _______ muscles

Skeletal

The buildup of lactic acid in the muscle leads to a conditon

Fatigue

What process needs energy?

Muscle contraction and relaxation

An electric impulse travels along the nerve cell

Action potential

The lowest intensity of the stimulus causes the production of an action potential

Alarm threshold

A fatty substance that coats the axons of some nerve cells, thus, helping to speed up the transmission of nerve impulses

Nervous system

Chemicals that diffuse across a synapse and bind to receptors on a nearby nerve cell

Neurotransmitters

The brainstem consists of

The medulla oblongata and pons

If a person has an accident and suffers from memory loss, the injury may be in the

Cerebum

The part that is responsible for balance and typing on the keyboard

Cerebellum

If a predator chases you the part of the nervous system that works is

Sympathetic nervous system

A person was injured in an accident, and upon examining him, the doctor found a disturbance in the heartbeat, so he suspected that the injury would be in

Medulla oblongata

Drugs affect neurotransmitters in the nervous system by

Increased secretion

The part responsible for the internal balance and regulation of water in the body

Hypothalamus

Which reduces brain activity?

Alcohol

One of the neurotransmitters in the brain which is related to the regulation of body movement and the human feeling of happiness and comfort

Dopamine

Psychological and physiological dependence on the drug is

Addiction

A chamber in the heart that recieves blood from all parts of the body

Chamber of the right atrium

The blood group in which has no antigens and it has antibodies to A and B

O

A chamber in the heart that sends oxygenated blood to all parts of the body

Left ventricle

Vessels that carry oxygenated blood from the heart to the rest of the body

Arteries

What process causes the diaphragm to move down and flatten?

Inhalation

The sinoatrial nodes are located at the

Right atrium

What process takes place inside the tissue cells of the legs?

Cellular respiration

Which of the following is wrong for a blood transfusion?

2

Wherre is the Henley loop located?

Renal tubules

What process turns sugar to the blood?

Reabsorption

An enzyme in the mouth that converts starch into simple sugars

Salivary enzyme

Where is the cardiac sphincter muscle located?

Between the esophagus and stomach